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Eli Friedman 45401535d6 [CodeGen] Fix forward scan in MachineBasicBlock::computeRegisterLiveness.
The scan was incorrectly skipping the first instruction, so a register
could appear to be dead when it was actually live. This eventually leads
to a machine verifier failure and miscompile in arm-ldst-opt.

Differential Revision: https://reviews.llvm.org/D54491

llvm-svn: 346821
2018-11-14 00:39:29 +00:00
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