Merge pull request dotnet/coreclr#11240 from wtgodbe/SourceBranch
authorWilliam Godbe <wigodbe@microsoft.com>
Thu, 27 Apr 2017 01:55:16 +0000 (18:55 -0700)
committerGitHub <noreply@github.com>
Thu, 27 Apr 2017 01:55:16 +0000 (18:55 -0700)
Use SourceBranch from pipebuild to define Helix Branch

Commit migrated from https://github.com/dotnet/coreclr/commit/4d1df6367de8df74a4d1fb3fe079e181c511d76b


Trivial merge