[flang][OpenMP] Fix crash in declare reduction with intrinsic operators (#182978) genOMP for OpenMPDeclareReductionConstruct unconditionally extracts ProcedureDesignator from OmpReductionIdentifier, but when the reduction identifier is an intrinsic operator like `+`, the parser produces a DefinedOperator instead. This causes a std::get crash. Visit both variants of OmpReductionIdentifier to extract the reduction name string, handling DefinedOperator (with IntrinsicOperator and DefinedOpName sub-variants) alongside the existing ProcedureDesignator path. This fixes the ICE; the underlying lack of derived-type reduction support (TODO in ReductionProcessor::getReductionInitValue) remains a separate issue. Co-authored-by: Matt P. Dziubinski <matt-p.dziubinski@hpe.com>
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