Tim Northover efbf7d1ceb Revert "X86: elide comparisons after cmpxchg instructions."
This reverts commit r210523. It was committed prematurely without waiting for
review.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210524 91177308-0d34-0410-b5e6-96231b3b80d8
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