Merge pull request dotnet/coreclr#10005 from stephentoub/taskextensions
authorStephen Toub <stoub@microsoft.com>
Wed, 8 Mar 2017 01:02:56 +0000 (20:02 -0500)
committerGitHub <noreply@github.com>
Wed, 8 Mar 2017 01:02:56 +0000 (20:02 -0500)
Add TaskExtensions to CoreLib

Commit migrated from https://github.com/dotnet/coreclr/commit/d2d91ddc7a104f5e372a1cfa419ab7cde9b51b3f


Trivial merge