Make thinlto action command lines standalone

This cl introduces an incompatible flag `--incompatible_make_thinlto_command_lines_standalone`, which when flipped will change Bazel's handling of thinlto:

1) lto-backend action_config now has to be defined in the CcToolchainConfigInfo
2) lto-indexing action is split into:
    * lto-index-for-executable
    * lto-index-for-dynamic-library
    * lto-index-for-nodeps-dynamic-library
3) all these need an action_config too
4) lto-indexing action is completely ignored
5) lto indexing command line is now defined independently of c++-link-executable, c++-link-dynamic-library, and c++-link-nodeps-dynamic-library, flags are no longer reused.

https://github.com/bazelbuild/bazel/issues/6791

RELNOTES: Incompatible flag `--incompatible_make_thinlto_command_lines_standalone` has been added. See https://github.com/bazelbuild/bazel/issues/6791 for details.
PiperOrigin-RevId: 243988905
12 files changed
tree: 835348fedc3cf4e8da0f9348c73fb4db3b4135d0
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
README.md

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