Reinstate "Compile StdlibUnittest with -sil-serialize-all.""
Reinstate "Compile StdlibUnittest with -sil-serialize-all.""

This reinstates commit 79517a8edfb6a8734c6b3025d76cc54c8d157a6a.

Let's try again. All blocking problems should be resolved now.
Compiling StdlibUnittest with -sil-serialize-all gives a much higher test coverage because we can inline and optimize unittest code togeter with the test file.
It already helped to uncover some compiler bugs which we wouldn't have found without this change.

On the downside, a test-run in optimized mode takes considerable longer than before, because some tests need much longer to compile.

johnno1962d/swift,hooman/swift,therealbnut/swift,practicalswift/swift,therealbnut/swift,djwbrown/swift,manavgabhawala/swift,bitjammer/swift,amraboelela/swift,OscarSwanros/swift,shahmishal/swift,xedin/swift,tjw/swift,IngmarStein/swift,CodaFi/swift,uasys/swift,ben-ng/swift,arvedviehweger/swift,manavgabhawala/swift,hooman/swift,austinzheng/swift,slavapestov/swift,parkera/swift,ahoppen/swift,SwiftAndroid/swift,kperryua/swift,ahoppen/swift,kperryua/swift,djwbrown/swift,JaSpa/swift,brentdax/swift,danielmartin/swift,alblue/swift,shahmishal/swift,zisko/swift,natecook1000/swift,jckarter/swift,manavgabhawala/swift,aschwaighofer/swift,jtbandes/swift,IngmarStein/swift,gottesmm/swift,hughbe/swift,dduan/swift,amraboelela/swift,OscarSwanros/swift,parkera/swift,bitjammer/swift,uasys/swift,jopamer/swift,sschiau/swift,bitjammer/swift,KrishMunot/swift,modocache/swift,tjw/swift,aschwaighofer/swift,JaSpa/swift,JaSpa/swift,deyton/swift,amraboelela/swift,tkremenek/swift,frootloops/swift,djwbrown/swift,shahmishal/swift,CodaFi/swift,allevato/swift,danielmartin/swift,danielmartin/swift,rudkx/swift,natecook1000/swift,natecook1000/swift,nathawes/swift,russbishop/swift,nathawes/swift,gmilos/swift,dduan/swift,manavgabhawala/swift,gribozavr/swift,allevato/swift,benlangmuir/swift,jopamer/swift,adrfer/swift,felix91gr/swift,calebd/swift,gregomni/swift,uasys/swift,kstaring/swift,karwa/swift,slavapestov/swift,jopamer/swift,rudkx/swift,sschiau/swift,huonw/swift,tkremenek/swift,practicalswift/swift,parkera/swift,swiftix/swift,gottesmm/swift,xwu/swift,karwa/swift,huonw/swift,tjw/swift,glessard/swift,practicalswift/swift,practicalswift/swift,bitjammer/swift,practicalswift/swift,atrick/swift,johnno1962d/swift,arvedviehweger/swift,jopamer/swift,zisko/swift,gribozavr/swift,Jnosh/swift,slavapestov/swift,airspeedswift/swift,danielmartin/swift,shajrawi/swift,tinysun212/swift-windows,felix91gr/swift,IngmarStein/swift,deyton/swift,xwu/swift,shajrawi/swift,therealbnut/swift,natecook1000/swift,ben-ng/swift,OscarSwanros/swift,harlanhaskins/swift,codestergit/swift,austinzheng/swift,KrishMunot/swift,atrick/swift,SwiftAndroid/swift,milseman/swift,felix91gr/swift,austinzheng/swift,tinysun212/swift-windows,johnno1962d/swift,KrishMunot/swift,karwa/swift,manavgabhawala/swift,tardieu/swift,stephentyrone/swift,xwu/swift,stephentyrone/swift,kperryua/swift,amraboelela/swift,xedin/swift,tkremenek/swift,jtbandes/swift,tkremenek/swift,ken0nek/swift,shahmishal/swift,OscarSwanros/swift,uasys/swift,sschiau/swift,gregomni/swift,kstaring/swift,harlanhaskins/swift,Jnosh/swift,adrfer/swift,Jnosh/swift,gribozavr/swift,xwu/swift,apple/swift,jtbandes/swift,stephentyrone/swift,stephentyrone/swift,kstaring/swift,bitjammer/swift,slavapestov/swift,lorentey/swift,allevato/swift,tjw/swift,dduan/swift,dduan/swift,tardieu/swift,stephentyrone/swift,tjw/swift,xedin/swift,gribozavr/swift,ken0nek/swift,brentdax/swift,lorentey/swift,airspeedswift/swift,aschwaighofer/swift,xedin/swift,OscarSwanros/swift,aschwaighofer/swift,allevato/swift,tardieu/swift,CodaFi/swift,calebd/swift,modocache/swift,hughbe/swift,brentdax/swift,natecook1000/swift,danielmartin/swift,gmilos/swift,codestergit/swift,kperryua/swift,benlangmuir/swift,dduan/swift,KrishMunot/swift,Jnosh/swift,harlanhaskins/swift,therealbnut/swift,kstaring/swift,benlangmuir/swift,huonw/swift,airspeedswift/swift,CodaFi/swift,jmgc/swift,austinzheng/swift,parkera/swift,therealbnut/swift,nathawes/swift,devincoughlin/swift,Jnosh/swift,codestergit/swift,codestergit/swift,SwiftAndroid/swift,russbishop/swift,return/swift,calebd/swift,IngmarStein/swift,roambotics/swift,milseman/swift,parkera/swift,apple/swift,tinysun212/swift-windows,return/swift,swiftix/swift,tinysun212/swift-windows,slavapestov/swift,xedin/swift,roambotics/swift,frootloops/swift,JGiola/swift,kstaring/swift,ahoppen/swift,harlanhaskins/swift,brentdax/swift,JaSpa/swift,adrfer/swift,frootloops/swift,russbishop/swift,kstaring/swift,glessard/swift,tkremenek/swift,lorentey/swift,hughbe/swift,gregomni/swift,codestergit/swift,tinysun212/swift-windows,djwbrown/swift,ahoppen/swift,devincoughlin/swift,kperryua/swift,ken0nek/swift,adrfer/swift,CodaFi/swift,alblue/swift,therealbnut/swift,dreamsxin/swift,OscarSwanros/swift,danielmartin/swift,airspeedswift/swift,apple/swift,huonw/swift,Jnosh/swift,deyton/swift,apple/swift,frootloops/swift,jmgc/swift,atrick/swift,gottesmm/swift,devincoughlin/swift,gregomni/swift,jckarter/swift,calebd/swift,ken0nek/swift,gottesmm/swift,ken0nek/swift,arvedviehweger/swift,KrishMunot/swift,SwiftAndroid/swift,swiftix/swift,tardieu/swift,practicalswift/swift,tinysun212/swift-windows,arvedviehweger/swift,hooman/swift,calebd/swift,adrfer/swift,airspeedswift/swift,huonw/swift,djwbrown/swift,JGiola/swift,russbishop/swift,return/swift,devincoughlin/swift,alblue/swift,alblue/swift,roambotics/swift,JGiola/swift,lorentey/swift,tkremenek/swift,jckarter/swift,jopamer/swift,djwbrown/swift,frootloops/swift,deyton/swift,alblue/swift,amraboelela/swift,benlangmuir/swift,IngmarStein/swift,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