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Fixes [Bug #21201] This change addresses a performance regression where defining methods inside `refine` blocks caused severe slowdowns. The issue was due to `rb_clear_all_refinement_method_cache()` triggering a full object space scan via `rb_objspace_each_objects` to find and invalidate affected callcaches, which is very inefficient. To fix this, I introduce `vm->cc_refinement_table` to track callcaches related to refinements. This allows us to invalidate only the necessary callcaches without scanning the entire heap, resulting in significant performance improvement.