[LLVM] Add environment triple for 'llvm' (#117218)

Summary:
The LLVM C library is an in-development environment for running
executables on various systems. Similarly how we have `-gnu` to indicate
that we are using a GNU toolchain we should support `-llvm` to indicate
the LLVM C library. This patch only adds the basic support for the
triple and does not do any necessary clang changes to handle compiling
with it.

Fixes https://github.com/llvm/llvm-project/issues/117251
3 files changed
tree: cb58f1346f38d1a4f8cd9b6ed62572a44e337403
  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
README.md

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