Merge pull request dotnet/coreclr#9714 from BruceForstall/FixRegMasks
authorBruce Forstall <brucefo@microsoft.com>
Wed, 22 Feb 2017 19:29:58 +0000 (11:29 -0800)
committerGitHub <noreply@github.com>
Wed, 22 Feb 2017 19:29:58 +0000 (11:29 -0800)
Fix non-Windows amd64 register mask initialization

Commit migrated from https://github.com/dotnet/coreclr/commit/27d5d92f6a07f515dff2074a77f4ee63477e5456


Trivial merge