[flang][OpenMP] Stop tracking metadirective level in name resolution (#159945) This was checked in the visitor for OmpDirectiveSpecification, and is not necessary anymore: the early exit (in case of not being inside of a METADIRECTIVE) performs the same actions as the code that was skipped, except it does so through a different sequence of function calls. The net result ends up being the same in either case. The processing of the mapper and reduction specifiers inside of OmpDirectiveSpecification is necesary for the declare directives on WHEN/OTHERWISE clauses, so it's the early exit that needs to be removed. In fact, when the DECLARE_MAPPER/REDUCTION use OmpDirectiveSpecification, this processing will automatically take over the handling of the contained specifiers.
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