[PATCH] D105639: GlobalISel: Track original argument index in ArgInfo

[Matt Arsenault via Phabricator via llvm-commits]

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SelectionDAG's equivalents in ISD::InputArg/OutputArg track the
original argument index. Mips relies on this, and its currently
reinventing its own parallel CallLowering infrastructure which tracks
these indexes on the side. Add this to help move towards deleting the
custom mips handling.


https://reviews.llvm.org/D105639

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CallLowering.h
  llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
  llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp
  llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
  llvm/lib/Target/ARM/ARMCallLowering.cpp
  llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
  llvm/lib/Target/Mips/MipsCallLowering.cpp
  llvm/lib/Target/PowerPC/GISel/PPCCallLowering.cpp
  llvm/lib/Target/X86/X86CallLowering.cpp
  llvm/unittests/CodeGen/GlobalISel/LegalizerHelperTest.cpp

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