[PATCH] Disable DAGCombine for -O0 and optnone

[Michael Kuperstein]

I think what Elena means is that it may be a good idea to check that the tests that currently run with -O3 don't *crash* (because of selection failures) when run with -O0.
They can, of course, fail due to unmatched CHECK lines.


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http://reviews.llvm.org/D9992

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