[llvm] r306529 - [X86] Correct dwarf unwind information in function epilogue

[Petar Jovanovic via llvm-commits]

> The buildbot is not quite done with the revision, but the checks that failed before are now green again:
> http://lab.llvm.org:8011/builders/sanitizer-ppc64be-linux/builds/3125

Yes, it was due to this change.

> If it doesn't go back to green, we can recommit (and fix the original
> commit message at the same time :) ).

What would you change in the commit message?