rename CompareExchange to CmpXchg
This is the name used by x86 (CMPXCHG) and LLVM. Also reorder the result (value first, boolean second) for consistency with LLVM, because why not.
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This is the name used by x86 (CMPXCHG) and LLVM. Also reorder the result (value first, boolean second) for consistency with LLVM, because why not.