[PATCH] D156549: [RISCV] Implement shadow stack with Zicfiss.

[Yeting Kuo via Phabricator via llvm-commits]

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The patch only implements shadow stack on shadow stack mode [0]. Using shadow stack
mode means that programs still store the return address to regular address.
Control stack mode, the another mode operated by shadow stack is to avoid store
the return address to regular stack.

[0]: https://github.com/riscv/riscv-cfi/blob/main/cfi_backward.adoc#push-to-and-pop-from-the-shadow-stack


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156549

Files:
  llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
  llvm/test/CodeGen/RISCV/shadowcallstack.ll

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