[PATCH] fix an invisible bug when combining repeated FP divisors

[Sanjay Patel]

Ping.

If possible, I'd like to postpone the FMF question and just decide what the right solution for this bug is independently of FMF.
Ie, is it necessary to use CombineTo here rather than RAUW? And is it wrong to return an empty SDValue() after we changed the DAG?


http://reviews.llvm.org/D9893

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