Fix test under MSVC
Fix test under MSVC

Optimizer was spotting that src1 and src2 would be identical and merging
them.

baylabs/grpc,dgquintas/grpc,nicolasnoble/grpc,Crevil/grpc,ncteisen/grpc,fuchsia-mirror/third_party-grpc,dgquintas/grpc,ejona86/grpc,thinkerou/grpc,zhimingxie/grpc,pszemus/grpc,firebase/grpc,carl-mastrangelo/grpc,pszemus/grpc,quizlet/grpc,dklempner/grpc,ncteisen/grpc,deepaklukose/grpc,thinkerou/grpc,greasypizza/grpc,ctiller/grpc,sreecha/grpc,msmania/grpc,chrisdunelm/grpc,ctiller/grpc,ncteisen/grpc,zhimingxie/grpc,baylabs/grpc,PeterFaiman/ruby-grpc-minimal,apolcyn/grpc,adelez/grpc,dklempner/grpc,apolcyn/grpc,kriswuollett/grpc,ipylypiv/grpc,yang-g/grpc,yongni/grpc,MakMukhi/grpc,grpc/grpc,MakMukhi/grpc,zhimingxie/grpc,muxi/grpc,Vizerai/grpc,PeterFaiman/ruby-grpc-minimal,ipylypiv/grpc,sreecha/grpc,kpayson64/grpc,mehrdada/grpc,jboeuf/grpc,murgatroid99/grpc,a11r/grpc,LuminateWireless/grpc,sreecha/grpc,hstefan/grpc,carl-mastrangelo/grpc,nicolasnoble/grpc,soltanmm-google/grpc,yugui/grpc,carl-mastrangelo/grpc,matt-kwong/grpc,apolcyn/grpc,nicolasnoble/grpc,makdharma/grpc,dklempner/grpc,vjpai/grpc,jboeuf/grpc,makdharma/grpc,Vizerai/grpc,wcevans/grpc,apolcyn/grpc,murgatroid99/grpc,kumaralokgithub/grpc,muxi/grpc,ejona86/grpc,grpc/grpc,rjshade/grpc,apolcyn/grpc,stanley-cheung/grpc,stanley-cheung/grpc,LuminateWireless/grpc,ejona86/grpc,Crevil/grpc,quizlet/grpc,kpayson64/grpc,chrisdunelm/grpc,jtattermusch/grpc,jboeuf/grpc,7anner/grpc,grpc/grpc,ejona86/grpc,vjpai/grpc,greasypizza/grpc,wcevans/grpc,hstefan/grpc,chrisdunelm/grpc,nicolasnoble/grpc,pszemus/grpc,adelez/grpc,murgatroid99/grpc,rjshade/grpc,kpayson64/grpc,soltanmm-google/grpc,PeterFaiman/ruby-grpc-minimal,muxi/grpc,LuminateWireless/grpc,mehrdada/grpc,nicolasnoble/grpc,kskalski/grpc,LuminateWireless/grpc,daniel-j-born/grpc,grpc/grpc,kskalski/grpc,philcleveland/grpc,murgatroid99/grpc,adelez/grpc,yugui/grpc,makdharma/grpc,thinkerou/grpc,mehrdada/grpc,greasypizza/grpc,vsco/grpc,mehrdada/grpc,LuminateWireless/grpc,carl-mastrangelo/grpc,msmania/grpc,pmarks-net/grpc,deepaklukose/grpc,dgquintas/grpc,stanley-cheung/grpc,grpc/grpc,ctiller/grpc,MakMukhi/grpc,soltanmm-google/grpc,grpc/grpc,donnadionne/grpc,murgatroid99/grpc,murgatroid99/grpc,kumaralokgithub/grpc,simonkuang/grpc,wcevans/grpc,infinit/grpc,grani/grpc,makdharma/grpc,grani/grpc,a11r/grpc,chrisdunelm/grpc,pmarks-net/grpc,philcleveland/grpc,geffzhang/grpc,firebase/grpc,grani/grpc,pmarks-net/grpc,pszemus/grpc,LuminateWireless/grpc,dklempner/grpc,yang-g/grpc,sreecha/grpc,royalharsh/grpc,muxi/grpc,jtattermusch/grpc,grpc/grpc,a11r/grpc,royalharsh/grpc,yongni/grpc,philcleveland/grpc,deepaklukose/grpc,makdharma/grpc,hstefan/grpc,jboeuf/grpc,jboeuf/grpc,pszemus/grpc,Vizerai/grpc,adelez/grpc,vjpai/grpc,philcleveland/grpc,Crevil/grpc,yugui/grpc,chrisdunelm/grpc,geffzhang/grpc,Crevil/grpc,donnadionne/grpc,royalharsh/grpc,carl-mastrangelo/grpc,msmania/grpc,apolcyn/grpc,kumaralokgithub/grpc,fuchsia-mirror/third_party-grpc,makdharma/grpc,jtattermusch/grpc,ejona86/grpc,Crevil/grpc,daniel-j-born/grpc,deepaklukose/grpc,ncteisen/grpc,a11r/grpc,greasypizza/grpc,matt-kwong/grpc,yongni/grpc,matt-kwong/grpc,pmarks-net/grpc,PeterFaiman/ruby-grpc-minimal,philcleveland/grpc,baylabs/grpc,pszemus/grpc,chrisdunelm/grpc,vsco/grpc,sreecha/grpc,sreecha/grpc,grani/grpc,philcleveland/grpc,muxi/grpc,thinkerou/grpc,simonkuang/grpc,ncteisen/grpc,infinit/grpc,chrisdunelm/grpc,ctiller/grpc,PeterFaiman/ruby-grpc-minimal,grpc/grpc,firebase/grpc,vsco/grpc,yugui/grpc,PeterFaiman/ruby-grpc-minimal,mehrdada/grpc,muxi/grpc,rjshade/grpc,ncteisen/grpc,hstefan/grpc,kumaralokgithub/grpc,msmania/grpc,quizlet/grpc,Vizerai/grpc,dklempner/grpc,carl-mastrangelo/grpc,kumaralokgithub/grpc,stanley-cheung/grpc,firebase/grpc,Crevil/grpc,royalharsh/grpc,geffzhang/grpc,jboeuf/grpc,vjpai/grpc,Vizerai/grpc,hstefan/grpc,jboeuf/grpc,pmarks-net/grpc,grpc/grpc,ncteisen/grpc,firebase/grpc,matt-kwong/grpc,vsco/grpc,grani/grpc,wcevans/grpc,carl-mastrangelo/grpc,sreecha/grpc,geffzhang/grpc,rjshade/grpc,dgquintas/grpc,wcevans/grpc,daniel-j-born/grpc,yongni/grpc,chrisdunelm/grpc,chrisdunelm/grpc,MakMukhi/grpc,stanley-cheung/grpc,a11r/grpc,jtattermusch/grpc,donnadionne/grpc,dgquintas/grpc,yugui/grpc,kriswuollett/grpc,vsco/grpc,ejona86/grpc,thinkerou/grpc,firebase/grpc,thinkerou/grpc,ejona86/grpc,zhimingxie/grpc,kpayson64/grpc,7anner/grpc,baylabs/grpc,royalharsh/grpc,ncteisen/grpc,yugui/grpc,infinit/grpc,geffzhang/grpc,ipylypiv/grpc,vjpai/grpc,jboeuf/grpc,deepaklukose/grpc,jboeuf/grpc,Vizerai/grpc,pmarks-net/grpc,yang-g/grpc,vjpai/grpc,quizlet/grpc,fuchsia-mirror/third_party-grpc,adelez/grpc,kskalski/grpc,vjpai/grpc,carl-mastrangelo/grpc,quizlet/grpc,ipylypiv/grpc,chrisdunelm/grpc,donnadionne/grpc,kpayson64/grpc,deepaklukose/grpc,firebase/grpc,msmania/grpc,ejona86/grpc,baylabs/grpc,soltanmm-google/grpc,fuchsia-mirror/third_party-grpc,ctiller/grpc,daniel-j-born/grpc,pszemus/grpc,kumaralokgithub/grpc,vjpai/grpc,geffzhang/grpc,kriswuollett/grpc,sreecha/grpc,jboeuf/grpc,ctiller/grpc,yang-g/grpc,simonkuang/grpc,royalharsh/grpc,kpayson64/grpc,firebase/grpc,Vizerai/grpc,kriswuollett/grpc,quizlet/grpc,yongni/grpc,stanley-cheung/grpc,mehrdada/grpc,yongni/grpc,PeterFaiman/ruby-grpc-minimal,sreecha/grpc,kriswuollett/grpc,mehrdada/grpc,MakMukhi/grpc,thinkerou/grpc,yang-g/grpc,jtattermusch/grpc,kpayson64/grpc,nicolasnoble/grpc,matt-kwong/grpc,zhimingxie/grpc,makdharma/grpc,sreecha/grpc,muxi/grpc,mehrdada/grpc,firebase/grpc,stanley-cheung/grpc,yongni/grpc,ctiller/grpc,msmania/grpc,7anner/grpc,donnadionne/grpc,greasypizza/grpc,daniel-j-born/grpc,kumaralokgithub/grpc,7anner/grpc,simonkuang/grpc,ipylypiv/grpc,geffzhang/grpc,msmania/grpc,carl-mastrangelo/grpc,vjpai/grpc,stanley-cheung/grpc,LuminateWireless/grpc,mehrdada/grpc,Crevil/grpc,Vizerai/grpc,chrisdunelm/grpc,a11r/grpc,msmania/grpc,pmarks-net/grpc,kpayson64/grpc,mehrdada/grpc,infinit/grpc,ipylypiv/grpc,pszemus/grpc,carl-mastrangelo/grpc,vsco/grpc,quizlet/grpc,grani/grpc,kskalski/grpc,deepaklukose/grpc,vsco/grpc,dgquintas/grpc,kriswuollett/grpc,soltanmm-google/grpc,MakMukhi/grpc,stanley-cheung/grpc,ncteisen/grpc,kskalski/grpc,dgquintas/grpc,Vizerai/grpc,fuchsia-mirror/third_party-grpc,infinit/grpc,donnadionne/grpc,a11r/grpc,infinit/grpc,greasypizza/grpc,LuminateWireless/grpc,simonkuang/grpc,quizlet/grpc,pmarks-net/grpc,carl-mastrangelo/grpc,pmarks-net/grpc,jboeuf/grpc,ctiller/grpc,donnadionne/grpc,murgatroid99/grpc,soltanmm-google/grpc,grani/grpc,wcevans/grpc,vsco/grpc,simonkuang/grpc,yugui/grpc,dklempner/grpc,jtattermusch/grpc,pszemus/grpc,muxi/grpc,nicolasnoble/grpc,ctiller/grpc,thinkerou/grpc,kriswuollett/grpc,murgatroid99/grpc,Crevil/grpc,ipylypiv/grpc,Vizerai/grpc,firebase/grpc,ipylypiv/grpc,jtattermusch/grpc,7anner/grpc,yugui/grpc,donnadionne/grpc,firebase/grpc,Crevil/grpc,vjpai/grpc,a11r/grpc,quizlet/grpc,dklempner/grpc,wcevans/grpc,ipylypiv/grpc,yongni/grpc,thinkerou/grpc,nicolasnoble/grpc,kskalski/grpc,soltanmm-google/grpc,yang-g/grpc,donnadionne/grpc,LuminateWireless/grpc,fuchsia-mirror/third_party-grpc,zhimingxie/grpc,dgquintas/grpc,simonkuang/grpc,royalharsh/grpc,ejona86/grpc,jtattermusch/grpc,pszemus/grpc,philcleveland/grpc,kumaralokgithub/grpc,stanley-cheung/grpc,adelez/grpc,zhimingxie/grpc,baylabs/grpc,ctiller/grpc,stanley-cheung/grpc,ejona86/grpc,nicolasnoble/grpc,kpayson64/grpc,rjshade/grpc,firebase/grpc,matt-kwong/grpc,thinkerou/grpc,PeterFaiman/ruby-grpc-minimal,infinit/grpc,dgquintas/grpc,adelez/grpc,dgquintas/grpc,royalharsh/grpc,infinit/grpc,daniel-j-born/grpc,muxi/grpc,soltanmm-google/grpc,apolcyn/grpc,murgatroid99/grpc,royalharsh/grpc,jtattermusch/grpc,grani/grpc,soltanmm-google/grpc,hstefan/grpc,kskalski/grpc,msmania/grpc,baylabs/grpc,mehrdada/grpc,vsco/grpc,infinit/grpc,zhimingxie/grpc,a11r/grpc,fuchsia-mirror/third_party-grpc,fuchsia-mirror/third_party-grpc,kriswuollett/grpc,dklempner/grpc,pszemus/grpc,fuchsia-mirror/third_party-grpc,daniel-j-born/grpc,baylabs/grpc,muxi/grpc,7anner/grpc,hstefan/grpc,7anner/grpc,nicolasnoble/grpc,kpayson64/grpc,thinkerou/grpc,grpc/grpc,jtattermusch/grpc,muxi/grpc,donnadionne/grpc,yang-g/grpc,jtattermusch/grpc,ctiller/grpc,makdharma/grpc,MakMukhi/grpc,carl-mastrangelo/grpc,nicolasnoble/grpc,yang-g/grpc,kpayson64/grpc,dklempner/grpc,kskalski/grpc,ejona86/grpc,mehrdada/grpc,grpc/grpc,PeterFaiman/ruby-grpc-minimal,jboeuf/grpc,rjshade/grpc,MakMukhi/grpc,ncteisen/grpc,grpc/grpc,rjshade/grpc,zhimingxie/grpc,makdharma/grpc,adelez/grpc,baylabs/grpc,grani/grpc,adelez/grpc,daniel-j-born/grpc,philcleveland/grpc,rjshade/grpc,pszemus/grpc,stanley-cheung/grpc,ctiller/grpc,greasypizza/grpc,kumaralokgithub/grpc,yugui/grpc,simonkuang/grpc,matt-kwong/grpc,matt-kwong/grpc,matt-kwong/grpc,kskalski/grpc,dgquintas/grpc,vjpai/grpc,hstefan/grpc,7anner/grpc,greasypizza/grpc,kriswuollett/grpc,apolcyn/grpc,daniel-j-born/grpc,sreecha/grpc,sreecha/grpc,ncteisen/grpc,hstefan/grpc,simonkuang/grpc,deepaklukose/grpc,PeterFaiman/ruby-grpc-minimal,muxi/grpc,nicolasnoble/grpc,greasypizza/grpc,deepaklukose/grpc,geffzhang/grpc,geffzhang/grpc,vjpai/grpc,rjshade/grpc,donnadionne/grpc,yang-g/grpc,MakMukhi/grpc,ncteisen/grpc,murgatroid99/grpc,wcevans/grpc,ejona86/grpc,7anner/grpc,jtattermusch/grpc,thinkerou/grpc,yongni/grpc,apolcyn/grpc,donnadionne/grpc,wcevans/grpc,philcleveland/grpc,Vizerai/grpc,fuchsia-mirror/third_party-grpc