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The rewriter can keep track of multiple stack slots in the same register if they happen to have the same value. When an instruction modifies a stack slot by defining a register that is mapped to a stack slot, other stack slots in that register are no longer valid. This is a very rare problem, and I don't have a simple test case. I get the impression that VirtRegRewriter knows it is about to be deleted, inventing a last opaque problem. <rdar://problem/9204040> llvm-svn: 128562
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