[PATCH] D120926: [Mips] support "sp" named register

[Nick Desaulniers via Phabricator via llvm-commits]

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After Linux kernel commit
commit 200ed341b864 ("mips: Implement "current_stack_pointer"")
We observe the following build error when compiling the Linux kernel
targeting Mips:
fatal error: error in backend: Invalid register name global variable

Fixes: https://github.com/llvm/llvm-project/issues/54174
Link: https://github.com/ClangBuiltLinux/linux/issues/1608


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120926

Files:
  llvm/lib/Target/Mips/MipsISelLowering.cpp
  llvm/test/CodeGen/Mips/named-register-n32.ll
  llvm/test/CodeGen/Mips/named-register-n64.ll
  llvm/test/CodeGen/Mips/named-register-o32.ll

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