[D] Implement looking up members of D enums.

In D, all named enums are explicitly scoped (the C++ equivalent of enum class)
so they should be handled as such in the language-specific symbol lookup
routines.  However so as to support D compilers that don't emit enums as
DW_AT_enum_class, need to make sure that appropriate checks for
TYPE_DECLARED_CLASS are done.

gdb/ChangeLog

	* d-exp.y (type_aggregate_p): New function.
	(PrimaryExpression : TypeExp '.' IdentifierExp): Use it.
	(classify_inner_name): Likewise.
	* d-namespace.c (d_lookup_nested_symbol): Handle TYPE_CODE_ENUM.

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