[PATCH] CodeGen: Default overflow operations to expand so we don't have to assume targets are lying

[Jan Vesely]

Couple of targets (aarch64, arm x86, sparc) mark those as custom. I didn't find any that would set it to legal. I also grepped for patterns/instructions in .td and did not find any.


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  rL LLVM

http://reviews.llvm.org/D9265

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