Chris Lattner 309f20fc45 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41933 91177308-0d34-0410-b5e6-96231b3b80d8
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