Rollup merge of #32494 - pnkfelix:gate-parser-recovery-via-debugflag, r=nrc

Gate parser recovery via debugflag

Gate parser recovery via debugflag

Put in `-Z continue_parse_after_error`

This works by adding a method, `fn abort_if_no_parse_recovery`, to the
diagnostic handler in `syntax::errors`, and calling it after each
error is emitted in the parser.

(We might consider adding a debugflag to do such aborts in other
places where we are currently attempting recovery, such as resolve,
but I think the parser is the really important case to handle in the
face of #31994 and the parser bugs of varying degrees that were
injected by parse error recovery.)

r? @nikomatsakis

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