Merge pull request dotnet/coreclr#5263 from briansull/avoid-x8
authorBrian Sullivan <briansul@microsoft.com>
Sat, 28 May 2016 01:19:52 +0000 (18:19 -0700)
committerBrian Sullivan <briansul@microsoft.com>
Sat, 28 May 2016 01:19:52 +0000 (18:19 -0700)
Avoid using register x8 as it will be used as the RetBuf argument in the future

Commit migrated from https://github.com/dotnet/coreclr/commit/7711017de7e9f5d42a0db7fd46f7072a64460913


Trivial merge