Merge pull request dotnet/coreclr#13907 from stephentoub/valuetask_astask_caching
authorStephen Toub <stoub@microsoft.com>
Tue, 12 Sep 2017 06:49:53 +0000 (23:49 -0700)
committerGitHub <noreply@github.com>
Tue, 12 Sep 2017 06:49:53 +0000 (23:49 -0700)
Use AsyncTaskCache in ValueTask.AsTask()

Commit migrated from https://github.com/dotnet/coreclr/commit/9b0ba4188ac7161c4b04b30fed5eaa117d72eaed


Trivial merge