[PATCH] Mutate TargetLowering::shouldExpandAtomicRMWInIR to specifically dictate how AtomicRMWInsts are expanded.

[Richard Diamond]

In http://reviews.llvm.org/D7713#125228, @t.p.northover wrote:

> No tests?


It seems to me that the test would be passing existing tests, considering this patch happens only at an API boundary and doesn't change the behaviour of existing code.

> No explanation?


Apologies; I've added a summary.


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http://reviews.llvm.org/D7713

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