Following the discussion at #7870: `-fdump-passes` reports passes
enabled dynamically (e.g. loop2_unroll via `#pragma GCC unroll`) as OFF,
so they were missing from the pass dropdown although they were active.
Fixed by building the pass list from the dump files GCC actually wrote
instead.
While reworking this:
- Read all passes into a `passDumps` map shipped with the result, so
switching passes doesn't trigger a compile.
- Trim each dump to functions defined in the user's source, dropping
header/library functions; strip forced -lineno annotations from GIMPLE
(tree/IPA) dumps when Line Numbers is off, leaving RTL untouched.
- Exclude passes with empty output
- Add a GccDumpOutput type, backend unit tests and a cypress test.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
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