Teach GlobalLoadUsesSimpleEnoughForHeapSRA and the SROA rewriter how to handle
a limited form of PHI nodes. This finally fixes PR1639, speeding 179.art up from 7.84s to 3.13s on PPC. llvm-svn: 41933
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a limited form of PHI nodes. This finally fixes PR1639, speeding 179.art up from 7.84s to 3.13s on PPC. llvm-svn: 41933