[PATCH] Disable DAGCombine for -O0 and optnone

[Oleg Ranevskyy]

In http://reviews.llvm.org/D9992#178684, @probinson wrote:

>


Thank you for your feedback Paul!
I will update the patch according to your remarks. New version will also contain a fix for the CodeGen/ARM/2010-05-18-LocalAllocCrash.ll test, which crashes without DAGCombine as you noticed in PR22346. Just missed it somehow when creating the patch file.


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