Fix attaching ProcDump to instances when we launch xunit
Fix attaching ProcDump to instances when we launch xunit

We were launching xunit by ShellExecute'ing not the procdump executable,
but rather the folder that contained the procdump executable. That
really doesn't work well, it turns out.

sharwell/roslyn,dpoeschl/roslyn,tmeschter/roslyn,swaroop-sridhar/roslyn,bartdesmet/roslyn,aelij/roslyn,lorcanmooney/roslyn,weltkante/roslyn,Giftednewt/roslyn,aelij/roslyn,mattscheffer/roslyn,jcouv/roslyn,abock/roslyn,diryboy/roslyn,jmarolf/roslyn,MichalStrehovsky/roslyn,nguerrera/roslyn,stephentoub/roslyn,Giftednewt/roslyn,shyamnamboodiripad/roslyn,physhi/roslyn,mavasani/roslyn,DustinCampbell/roslyn,shyamnamboodiripad/roslyn,sharwell/roslyn,KirillOsenkov/roslyn,physhi/roslyn,gafter/roslyn,VSadov/roslyn,mattscheffer/roslyn,panopticoncentral/roslyn,wvdd007/roslyn,KevinRansom/roslyn,agocke/roslyn,sharwell/roslyn,physhi/roslyn,jcouv/roslyn,dotnet/roslyn,Giftednewt/roslyn,KirillOsenkov/roslyn,bartdesmet/roslyn,paulvanbrenk/roslyn,jcouv/roslyn,DustinCampbell/roslyn,jmarolf/roslyn,davkean/roslyn,tannergooding/roslyn,mattscheffer/roslyn,stephentoub/roslyn,dpoeschl/roslyn,nguerrera/roslyn,davkean/roslyn,jamesqo/roslyn,AlekseyTs/roslyn,tmeschter/roslyn,weltkante/roslyn,dotnet/roslyn,AlekseyTs/roslyn,tmat/roslyn,OmarTawfik/roslyn,diryboy/roslyn,eriawan/roslyn,abock/roslyn,ErikSchierboom/roslyn,genlu/roslyn,mavasani/roslyn,xasx/roslyn,gafter/roslyn,agocke/roslyn,genlu/roslyn,KevinRansom/roslyn,davkean/roslyn,AmadeusW/roslyn,reaction1989/roslyn,tmat/roslyn,reaction1989/roslyn,swaroop-sridhar/roslyn,wvdd007/roslyn,eriawan/roslyn,mgoertz-msft/roslyn,dpoeschl/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,KevinRansom/roslyn,ErikSchierboom/roslyn,brettfo/roslyn,bkoelman/roslyn,reaction1989/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,AlekseyTs/roslyn,AmadeusW/roslyn,swaroop-sridhar/roslyn,VSadov/roslyn,OmarTawfik/roslyn,jasonmalinowski/roslyn,weltkante/roslyn,heejaechang/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,gafter/roslyn,heejaechang/roslyn,MichalStrehovsky/roslyn,nguerrera/roslyn,xasx/roslyn,shyamnamboodiripad/roslyn,genlu/roslyn,CyrusNajmabadi/roslyn,wvdd007/roslyn,heejaechang/roslyn,OmarTawfik/roslyn,paulvanbrenk/roslyn,tmat/roslyn,bartdesmet/roslyn,abock/roslyn,mavasani/roslyn,cston/roslyn,tmeschter/roslyn,panopticoncentral/roslyn,jamesqo/roslyn,CyrusNajmabadi/roslyn,paulvanbrenk/roslyn,Hosch250/roslyn,DustinCampbell/roslyn,bkoelman/roslyn,brettfo/roslyn,MichalStrehovsky/roslyn,jamesqo/roslyn,tannergooding/roslyn,jmarolf/roslyn,stephentoub/roslyn,Hosch250/roslyn,ErikSchierboom/roslyn,jasonmalinowski/roslyn,lorcanmooney/roslyn,xasx/roslyn,brettfo/roslyn,cston/roslyn,jasonmalinowski/roslyn,agocke/roslyn,diryboy/roslyn,mgoertz-msft/roslyn,cston/roslyn,Hosch250/roslyn,mgoertz-msft/roslyn,aelij/roslyn,eriawan/roslyn,KirillOsenkov/roslyn,bkoelman/roslyn,lorcanmooney/roslyn,dotnet/roslyn,AmadeusW/roslyn,tannergooding/roslyn,CyrusNajmabadi/roslyn,panopticoncentral/roslyn,VSadov/roslyn