Merging r277755:

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r277755 | tnorthover | 2016-08-04 12:32:28 -0700 (Thu, 04 Aug 2016) | 5 lines

AArch64: don't assume all i128s are BUILD_PAIRs

It leads to a crash when they're not. I'm *sure* I've made this mistake before,
at least once.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@288845 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed