Merging r195409:
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r195409 | jiangning | 2013-11-21 18:46:20 -0800 (Thu, 21 Nov 2013) | 2 lines

For AArch64, intrinsic vget_low_xxx can be optimized away.

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_34@195765 91177308-0d34-0410-b5e6-96231b3b80d8