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This was discovered to be necessary while running memchr-01.ll with -verify-machinstrs, because it is not allowed to have a phys reg live accross block boundaries while on SSA form, if the register is allocatable (expect in entry block and landing pads). In this test case, stringRRE pseudos are expanded after isel by adding a loop block which produces a live out CC register. To make the test pass, it was also necessary to not say that StringRRELoop pseudo uses R0L, this is only true for the StringRRE opcode. -verify-machineinstrs added to memchr-01.ll test. New test case int-cmp-51.ll to test that MachineCSE can eliminate an identical compare (which it couldn't do before). Reviewed by Ulrich Weigand llvm-svn: 251634
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