Acknowledge profdata files in CoverageOutputGenerator.

This PR makes `CoverageOutputGenerator` aware that `collect_coverage.sh` might generate `.profdata` files.

There must at most one `.profdata` file generated per test otherwise `CoverageOutputGenerator` doesn't know how to merge them.

If there is one `.profdata` file then there must be no other type of coverage reports (`.dat`, `.gcov`) generated before `CoverageOutputGenerator` is invoked, otherwise there is no way to merge them.

If there is one `.profdata` file and no other coverage reports we copy the content of the `.profdata` file to the final coverage output file. This is not ideal but it unblocks some Bazel C++ coverage users.

This is temporary until #5881 will be fixed.

Closes #6192.

PiperOrigin-RevId: 213989514
4 files changed
tree: 280eb2148980a86dd6d803a8e9f886b28afed45d
  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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