Merge pull request dotnet/coreclr#11157 from mikedn/reg-encoding
authorBruce Forstall <brucefo@microsoft.com>
Mon, 24 Apr 2017 23:28:08 +0000 (16:28 -0700)
committerGitHub <noreply@github.com>
Mon, 24 Apr 2017 23:28:07 +0000 (16:28 -0700)
Simplify emitter's RegEncoding

Commit migrated from https://github.com/dotnet/coreclr/commit/80cd4598074372d13cef0afcf1375093e36ac0ff


Trivial merge