gdb: Convert language la_search_name_hash field to a method

This commit changes the language_data::la_search_name_hash
function pointer member variable into a member function of
language_defn.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* ada-lang.c (ada_language_data): Delete la_search_name_hash
	initializer.
	* c-lang.c (c_language_data): Likewise.
	(cplus_language_data): Likewise.
	(cplus_language::search_name_hash): New member function.
	(asm_language_data): Delete la_search_name_hash initializer.
	(minimal_language_data): Likewise.
	* d-lang.c (d_language_data): Likewise.
	* dictionary.c (default_search_name_hash): Rename to...
	(language_defn::search_name_hash): ...this.
	* f-lang.c (f_language_data): Likewise.
	(f_language::search_name_hash): New member function.
	* go-lang.c (go_language_data): Delete la_search_name_hash
	initializer.
	* language.c (unknown_language_data): Likewise.
	(auto_language_data): Likewise.
	* language.h (struct language_data): Delete la_search_name_hash
	field.
	(language_defn::search_name_hash): Declare new member function.
	(default_search_name_hash): Delete declaration.
	* m2-lang.c (m2_language_data): Delete la_search_name_hash
	initializer.
	* objc-lang.c (objc_language_data): Likewise.
	* opencl-lang.c (opencl_language_data): Likewise.
	* p-lang.c (pascal_language_data): Likewise.
	* rust-lang.c (rust_language_data): Likewise.
	* symtab.c (search_name_hash): Update call.

gdb/objc-lang.c

@@ -401,7 +401,6 @@ extern const struct language_data objc_language_data =
   default_collect_symbol_completion_matches,
   c_watch_location_expression,
   NULL,				/* la_get_symbol_name_matcher */
-  default_search_name_hash,
   &default_varobj_ops,
   NULL,
   c_is_string_type_p,