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ac26448a5c
This mirrors r222331, which enabled SeparateConstOffsetFromGEP on AArch64, in the PowerPC backend. Yields, on a POWER7 machine, a 30% speedup on SingleSource/Benchmarks/Shootout/nestedloop (this might just be from LICM, there is a store moved out of the inner loop) and a potential speedup on MultiSource/Benchmarks/mediabench/mpeg2/mpeg2dec/mpeg2decode. Regardless, it makes some code look cleaner, and synchronizing the backends in this regard seems like a generally good thing. llvm-svn: 222504
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