[PATCH] D135693: [WIP][RegisterScavenger][RISCV] Don't search for FrameSetup instrs if we were searching from Non-FrameSetup instrs

[luxufan via Phabricator via llvm-commits]

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Otherwise, the spill position may point to position where before
FrameSetup instructions. In which case, the spill instruction may store
to caller's frame since the stack pointer has not been adjustted.

Fixes https://github.com/llvm/llvm-project/issues/58286


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135693

Files:
  llvm/lib/CodeGen/RegisterScavenging.cpp
  llvm/test/CodeGen/RISCV/pr58286.ll

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