[llvm] [CGP] Permit tail call optimization on undefined return value (PR #82419)

[Emil J via llvm-commits]

ekliptik wrote:

- [ ] TODO: fix tests

>From CI: Failed Tests (3):
  LLVM :: CodeGen/AArch64/addsub.ll
  LLVM :: CodeGen/AArch64/callbr-asm-obj-file.ll
  LLVM :: CodeGen/RISCV/pr51206.ll

https://github.com/llvm/llvm-project/pull/82419