[PATCH] D132170: [ModuloSchedule] Add interface call to accept/reject SMS schedules

[David Penry via Phabricator via llvm-commits]

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This interface allows a target to reject a proposed
SMS schedule.  For Hexagon/PowerPC, all schedules
are accepted, leaving behavior unchanged.  For ARM,
schedules which exceed register pressure limits are
rejected.

Also, two RegisterPressureTracker methods now need to be public so
that register pressure can be computed by more callers.

Reapplication of D128941 <https://reviews.llvm.org/D128941> with small fix.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132170

Files:
  llvm/include/llvm/CodeGen/RegisterPressure.h
  llvm/include/llvm/CodeGen/TargetInstrInfo.h
  llvm/lib/CodeGen/MachinePipeliner.cpp
  llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
  llvm/test/CodeGen/Thumb2/swp-regpressure.mir

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