Bazel client: Refactor startup options parsing to gracefully handle user errors, rather than crash.

blaze::OptionProcessor::SplitCommandLine is a nice standalone helper function, and so it's undesirable for blaze::StartupOptions::IsNullary to intentionally crash the host program via BAZEL_DIE.

Even ignoring that, option_processor.h's comment for SplitCommandLine says "... If the method fails then error will contain the cause..." and so transitive BAZEL_DIE usage makes this comment technically incorrect. Therefore, this change here can be motivated by a desire to make that comment correct.

RELNOTES: None
PiperOrigin-RevId: 300896347
7 files changed
tree: 2b9440804532c30278b3fdba81bd8d988b5a9d45
  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. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

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