David Majnemer e165502ed7 MemoryDependenceAnalysis: Don't miscompile atomics ...

r216771 introduced a change to MemoryDependenceAnalysis that allowed it
to reason about acquire/release operations.  However, this change does
not ensure that the acquire/release operations pair.  Unfortunately,
this leads to miscompiles as we won't see an acquire load as properly
memory effecting.  This largely reverts r216771.

This fixes PR22708.

llvm-svn: 232889

2015-03-21 06:19:17 +00:00

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