[PATCH] [mips] Optimize folding of registers derived from the $zero register.

[Daniel Sanders]

I think this patch might have been missed because it has a '[mips]' tag but it affects SystemZ and X86 too. I'd suggest re-sending it with a more generic subject. Maybe something like 'Make foldMemoryOperandImpl() insert instructions instead of caller' and go on to say something like 'and use this to store zero to memory using $zero on Mips'.


http://reviews.llvm.org/D8289

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