ARM backend support for atomicrmw and cmpxchg with non-monotonic ordering.  Not especially pretty, but seems to work well enough.  If this looks okay, I'll put together similar patches for Mips, PPC, and Alpha.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136737 91177308-0d34-0410-b5e6-96231b3b80d8
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