language_lookup_primitive_type, std::function -> gdb::function_view

language_lookup_primitive_type, std::function -> gdb::function_view

gdb/ChangeLog:

	* language.c (language_arch_info::lookup_primitive_type): Use
	gdb::function_view instead of gdb::function.
	(template language_lookup_primitive_type): Rename to ...
	(language_lookup_primitive_type_1): ... this, and make static.
	(language_lookup_primitive_type(const struct language_defn *,
	struct gdbarch *, const char *): Make non-template.
	(language_lookup_primitive_type(const struct language_defn *,
	struct gdbarch *, std::function<bool (struct type *)>): Make
	non-template and use gdb::function_view.
	* language.h (language_arch_info::lookup_primitive_type): Use
	gdb::function_view instead of std::function.
	(language_lookup_primitive_type): No longer template.
	* opencl-lang.c (lookup_opencl_vector_type): 'filter' is now a
	lambda instead of a std::function.