Rollup merge of #152803 - TaKO8Ki:fix-152744-diagnostic-attr-ice, r=JonathanBrouwer

Avoid delayed-bug ICE for malformed diagnostic attrs

Fixes rust-lang/rust#152744

Skip suggestions in `expected_lit` when parsing with `Recovery::Forbidden`, since this may later cancel `InvalidMetaItem`. This avoids creating delayed bugs that can be promoted to ICE.

Author: JonathanBrouwer