gdb/fortran: Don't include module symbols when searching for types

Currently the 'info types' command will return symbols that correspond
to Fortran modules.  This is because the symbols are created with
domain MODULE_DOMAIN and address_class LOC_TYPEDEF.  The address_class
LOC_TYPEDEF is the same address_class used for type symbols which is
why the modules show up when listing types.

This commit explicitly prevents symbols in the MODULE_DOMAIN from
appearing when we search for symbols in the TYPES_DOMAIN, this
prevents the Fortran module symbols from appearing in the output of
'info types'.

gdb/ChangeLog:

	* symtab.c (search_symbols): Don't include MODULE_DOMAIN symbols
	when searching for types.

gdb/testsuite/ChangeLog:

	* gdb.fortran/info-types.exp: Add module.
	* gdb.fortran/info-types.f90: Update expected results.

gdb/symtab.c

@@ -4659,7 +4659,8 @@ search_symbols (const char *regexp, enum search_domain kind,
 				      || treg_matches_sym_type_name (*treg,
 								     sym)))
 			      || (kind == TYPES_DOMAIN
-				  && SYMBOL_CLASS (sym) == LOC_TYPEDEF))))
+				  && SYMBOL_CLASS (sym) == LOC_TYPEDEF
+				  && SYMBOL_DOMAIN (sym) != MODULE_DOMAIN))))
 		    {
 		      /* match */
 		      result.emplace_back (i, sym);