Implement -gccollectonly and -gconly collection flags.
Implement -gccollectonly and -gconly collection flags.

leculver/dotnet-reliability,Lucrecious/corefx-tools,transsight/testproject,schaabs/corefx-tools,schaabs/corefx-tools,leculver/dotnet-reliability,Lucrecious/corefx-tools,dotnet/corefx-tools,leculver/dotnet-reliability,Lucrecious/corefx-tools,leculver/dotnet-reliability,leculver/dotnet-reliability,transsight/testproject,leculver/dotnet-reliability,schaabs/corefx-tools