[PATCH] D98319: [AMDGPU] Always create Stack Object for reserved VGPR

[Ruiling, Song via Phabricator via llvm-commits]

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As we may overwrite inactive lanes of a caller-save-vgpr, we should
always save/restore the reserved vgpr for sgpr spill.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D98319

Files:
  llvm/lib/Target/AMDGPU/SILowerSGPRSpills.cpp
  llvm/test/CodeGen/AMDGPU/callee-frame-setup.ll
  llvm/test/CodeGen/AMDGPU/stack-realign.ll

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