[pull] master from ruby:master#1001
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Both rb_fiber_scheduler_unblock and rb_fiber_scheduler_fiber_interrupt used EC_PUSH_TAG but did not capture ec->cfp beforehand nor call rb_vm_rewind_cfp in the non-TAG_NONE branch. Without this, stale call frames can remain on the stack after an exception or other non-local jump, matching the structure rb_protect uses for the same pattern.
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