CodeGen: make use of weaker failure orders on cmpxchg.

CodeGen: make use of weaker failure orders on cmpxchg.

This makes Clang take advantage of the recent IR addition of a
"failure" memory ordering requirement. As with the "success" ordering,
we try to emit just a single version if the expression is constant,
but fall back to runtime detection (to allow optimisation across
function-call boundaries).

rdar://problem/15996804

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@203837 91177308-0d34-0410-b5e6-96231b3b80d8