[pull] master from ruby:master #295
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The validation is relevant only for traceable userland ruby objects ruby code could interact with. ZJIT's use of rb_vm_method_cfunc_is() allocates a CC imemo and was failing this validation when it was actually fine. Relax the check.
The same method entry may be reused in multiple caches, so once the CACHED flag is set, other Ractors may be checking for it being invalidated and we should avoid writing to the field again. I believe there are still other race conditions on how we manipulate these flags (particularly the invalidation bit), but this should make them less frequent.
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