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

[Sanjay Patel]

It's too soon to ping again :) 
but I should mention that FMF for the DAG made it back into trunk with:
http://reviews.llvm.org/D10403

The functionality is hidden behind an enable flag (disabled by default), so we can expose the bug that this patch attempts to solve by using:

  $ llc -enable-fmf-dag foo.ll

If we can resolve this bug, we can move on to other bugs that FMF may have exposed.


http://reviews.llvm.org/D9893

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