Merging r275978:

Merging r275978:
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r275978 | pgode | 2016-07-19 07:30:21 -0700 (Tue, 19 Jul 2016) | 7 lines

[AArch64] PredictableSelectIsExpensive for Vulcan.

Adding PredictableSelectIsExpensive for Vulcan

Differential Revision: https://reviews.llvm.org/D22448

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@276880 91177308-0d34-0410-b5e6-96231b3b80d8