[PATCH] Avoid combining adjacent stores at -O0 to improve debug experience

[Paul Robinson]

Filed PR22346... disabling all DAGCombine at -O0 does not have consensus, it seems, and is certainly not feasible without doing an unknown but clearly nontrivial amount of work first.

Can I get an LGTM on the patch as proposed? Thanks!


http://reviews.llvm.org/D7181

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