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[perl #43425] local $[: fix scoping during parser error handling.
Change 22306# inadvertently made 'local $[' statement-scoped
rather than block-scoped; so revert that change and add a
different fix. The problem was to ensure that the savestack got
popped correctly while popping errored tokens. We how record the
current value of PL_savestack_ix with each pushed parser state.
p4raw-id: //depot/perl@31615