Initial commit of perfcollect script.
Initial commit of perfcollect script.

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