[flang][OpenMP]Add symbls omp_in, omp_out and omp_priv in DECLARE RED… (#129908) …UCTION This patch allows better parsing of the reduction and initializer components, including supporting derived types in both those places. There is more work needed here, but this is a definite improvement in what can be handled through parser and semantics. Note that declare reduction is still not supported in lowering, so any attempt to compile DECLARE REDUCTION code will end with a TODO aka "Not yet implemented" abort in the compiler. Note that this version of the code does not cover declaring multiple reductions using the same name with different types. This is will be fixed in a future patch. [This was also the case before this change]. One existing test modified to actually compile (as it didn't in the original form).
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