[LLVMdev] Keeping Clang from changing function calls to IR operations: cmpxchg

[Dan]

I'm working on getting the LLVM/projects/Test-Suite/UnitTest to compile for
a target that I am developing.

There is an example: AtomicOps, that uses calls to:

__sync_fetch_and_add
__sync_val_compare_and_swap
__sync_lock_test_and_set

These get converted into llvm IR operations like:

atomicrmw
cmpxchg

Is there any way to keep these as function calls, as they are easier to map
to the target's eventual functional then having to deal with atomicrmw and
cmpxchg
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