[PATCH] D146749: [CodeGen] Fix nomerge attribute not working in tail calls.

[Zequan Wu via Phabricator via llvm-commits]

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Previously, that attribute won't apply to tail calls. This fixes it.

For ARM, I only made the new MI to inherit the flag under `TCRETURNdi` and `TCRETURNri`, because that's the place tail calls got replaced. Not sure if there's any other place needed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146749

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/AArch64/nomerge.ll
  llvm/test/CodeGen/ARM/nomerge.ll
  llvm/test/CodeGen/LoongArch/nomerge.ll
  llvm/test/CodeGen/PowerPC/nomerge.ll
  llvm/test/CodeGen/RISCV/nomerge.ll
  llvm/test/CodeGen/SystemZ/nomerge.ll
  llvm/test/CodeGen/X86/nomerge.ll

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