[flang] Detect use-before-decl errors on type parameters (#99947) Ensure that type parameters are declared as such before being referenced within the derived type definition. (Previously, such references would resolve to symbols in the enclosing scope.) This change causes the symbols for the type parameters to be created when the TYPE statement is processed in name resolution. They are TypeParamDetails symbols with no KIND/LEN attribute set, and they shadow any symbols of the same name in the enclosing scope. When the type parameter declarations are processed, the KIND/LEN attributes are set. Any earlier reference to a type parameter with no KIND/LEN attribute elicits an error. Some members of TypeParamDetails have been retyped &/or renamed.
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