[Flang] Use specific symbol rather than generic symbol in procedureInterface to declare procedure pointer.

Author: DanielCChen

flang/lib/Semantics/resolve-names.cpp

@@ -5648,7 +5648,9 @@ void DeclarationVisitor::Post(const parser::ProcDecl &x) {
   const auto &name{std::get<parser::Name>(x.t)};
   const Symbol *procInterface{nullptr};
   if (interfaceName_) {
-    procInterface = interfaceName_->symbol;
+    procInterface = interfaceName_->symbol->has<GenericDetails>()
+        ? interfaceName_->symbol->get<GenericDetails>().specific()
+        : interfaceName_->symbol;
   }
   auto attrs{HandleSaveName(name.source, GetAttrs())};
   DerivedTypeDetails *dtDetails{nullptr};