Eli Bendersky 87fcb536ab Teach LoopUnrollPass to respect loop unrolling hints in metadata.
See http://reviews.llvm.org/D4090 for more details.

The Clang change that produces this metadata was committed in r210667

Patch by Mark Heffernan.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210721 91177308-0d34-0410-b5e6-96231b3b80d8
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