Eli Friedman 29108843ff [LivePhysRegs] Preserve pristine regs in blocks with no successors. ...

One common source of blocks with no successors is calls to noreturn
functions; we want to preserve pristine registers in case they throw an
exception.

The whole pristine register thing is messy (we should really prefer to
explicitly model registers), but this fills a hole in the model for now.

Fixes https://bugs.llvm.org/show_bug.cgi?id=36073.

Differential Revision: https://reviews.llvm.org/D42509

llvm-svn: 323559

2018-01-26 20:23:00 +00:00

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