Craig Topper 42d77461f3 [MachineBasicBlock] Skip over debug instructions in computeRegisterLiveness before checking for begin ...

If there are debug instructions before the stopping point,
we need to skip over them before checking for begin in order
to avoid having the debug instructions effect behavior.

Fixes PR43758.

Differential Revision: https://reviews.llvm.org/D69606

2019-11-01 14:43:17 -07:00

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