LLVM BC support

Using [rules_swift](https://github.com/bazelbuild/rules_swift) it is possible to generate LLVM IR BC files using `swift.emit_bc` feature, some days ago a [refactor](https://github.com/bazelbuild/rules_swift/commit/8cf36354655e6baa276fd7a5bae29b00ee5757c3#diff-535d0dbea9614c6905a30dfdb0e708df3b16fc68f8930d6aba519342509dc657R1948) to use `create_compilation_outputs` from `cc_common` was merged, it is giving us the following error since the bc extension is missing, this pr fixes it

```
Error in create_compilation_outputs: 'Somefile.swift.bc' has wrong extension. The list of possible extensions for 'objects' is: .o,.obj,.pic.o,.opb
```

Closes #13889.

PiperOrigin-RevId: 392889724
2 files changed
tree: 102bf9e3cf6afb00cf20f1e653d57db4f3852704
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEBASE.md
  15. CODEOWNERS
  16. combine_distfiles.py
  17. combine_distfiles_to_tar.sh
  18. compile.sh
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. distdir.bzl
  22. distdir_deps.bzl
  23. ISSUE_TEMPLATE.md
  24. LICENSE
  25. README.md
  26. WORKSPACE
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