Thread Safety Analysis: Graduate ACQUIRED_BEFORE() and ACQUIRED_AFTER() from beta features (#152853)
Both these attributes were introduced in ab1dc2d54db5 ("Thread Safety
Analysis: add support for before/after annotations on mutexes") back in
2015 as "beta" features.
Anecdotally, we've been using `-Wthread-safety-beta` for years without
problems.
Furthermore, this feature requires the user to explicitly use these
attributes in the first place.
After 10 years, let's graduate the feature to the stable feature set,
and reserve `-Wthread-safety-beta` for new upcoming features.
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