[PATCH] D150575: [CodeGen] Make TargetRegisterInfo::supportsBackwardScavenger return true by default

[Jay Foad via Phabricator via llvm-commits]

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But override it to return false for all targets that implement
requiresRegisterScavenging. This should make the change NFC for all
in-tree targets, and out-of-tree targets if they add a similar override.

This paves the way for adding backwards scavenging support on a
target-by-target basis. It is preferred over forwards scavenging because
it does not rely on accurate kill flags. When all targets are converted
we can remove the forwards scavenging implementation.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150575

Files:
  llvm/include/llvm/CodeGen/TargetRegisterInfo.h
  llvm/lib/Target/AArch64/AArch64RegisterInfo.h
  llvm/lib/Target/AMDGPU/SIRegisterInfo.h
  llvm/lib/Target/ARC/ARCRegisterInfo.h
  llvm/lib/Target/ARM/ARMBaseRegisterInfo.h
  llvm/lib/Target/CSKY/CSKYRegisterInfo.h
  llvm/lib/Target/Hexagon/HexagonRegisterInfo.h
  llvm/lib/Target/Lanai/LanaiRegisterInfo.h
  llvm/lib/Target/LoongArch/LoongArchRegisterInfo.h
  llvm/lib/Target/M68k/M68kRegisterInfo.h
  llvm/lib/Target/Mips/MipsRegisterInfo.h
  llvm/lib/Target/PowerPC/PPCRegisterInfo.h
  llvm/lib/Target/RISCV/RISCVRegisterInfo.h
  llvm/lib/Target/SystemZ/SystemZRegisterInfo.h
  llvm/lib/Target/XCore/XCoreRegisterInfo.h

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