Tim Northover 70450c59a4 ARM: skip cmpxchg failure barrier if ordering is monotonic. ...

The terminal barrier of a cmpxchg expansion will be either Acquire or
SequentiallyConsistent. In either case it can be skipped if the
operation has Monotonic requirements on failure.

rdar://problem/15996804

llvm-svn: 205535

2014-04-03 13:06:54 +00:00

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