[HIP] Replace use of `llvm-mc` with `clang` (#112041)

Summary:
We currently use `llvm-mc` which is intended for internal testing and
not expected to be present in every installation. This patch changes
that to just use clang instead to get the `.o` from the HIP registration
code.

My preferred solution would be to use the new driver, but I still
haven't gotten the test suite to pass on this one weird OpenMP case.

Fixes: https://github.com/llvm/llvm-project/issues/112031
9 files changed
tree: 26d026dae042525772499a76c10e23844d33e973
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
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