[AMDGPU] Fix undefined scc register in successor block of SI_KILL terminators (#134718)

Fix issue 131298 where an undefined $scc register causes verifier errors
when using SI_KILL_F32_COND_IMM_TERMINATOR instructions. The problem
occurs because the $scc register defined in a comparison before the kill
terminator is used in successor blocks, but was not properly marked as live-in.

This patch:
- Adds code to check if SCC is used in the successor block
- Adds SCC as a live-in to successor blocks
- Handles both explicit and implicit uses of SCC

With this patch the machine verifier no longer reports undefined $scc
errors in following kill terminator instruction.

Fixes #131298

---------

Co-authored-by: Matt Arsenault <arsenm2@gmail.com>
4 files changed
tree: 39345a044b510c54a148416bf7ab941c7b28cfec
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. SECURITY.md
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