[PATCH] propagate IR-level fast-math-flags to DAG nodes, disabled by default

[Sanjay Patel]

In http://reviews.llvm.org/D10403#188479, @nlewycky wrote:

> This LGTM under the assumption that r237046 looked good too.


Thanks, Nick! r237046 was a limited form of:
http://reviews.llvm.org/rL236546
which was reviewed in http://reviews.llvm.org/D8900.

This patch checked in at r239828.

Please let me know if I can still take you up on this offer:
"Could you add FMF under a flag and then let me test it before turning it on? I can test for compiler crashes in 24 hours, or for miscompiles over a weekend."


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