[OpenMP] Fix tentative parsing crash with metadirective (#139901) There were two crashes that have the same root cause: not correctly handling unexpected tokens. In one case, we were failing to return early which caused us to parse a paren as a regular token instead of a special token, causing an assertion. The other case was failing to commit or revert the tentative parse action when not getting a paren when one was expected. Fixes #139665
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