[PATCH] D159277: [RISCV] Disable zcmp push/pop for variadic functions.

[Yeting Kuo via Phabricator via llvm-commits]

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Variadic function needs a save region for variable arguement and the region is
possible to be overlaped with the region of zcmp push/pop used.

The patch also replaces useSaveRestoreLibCalls with direct check for save-restore feature.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159277

Files:
  llvm/lib/Target/RISCV/RISCVMachineFunctionInfo.h
  llvm/test/CodeGen/RISCV/callee-saved-gprs.ll

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