gdb: Convert language la_language_arch_info field to a method

gdb: Convert language la_language_arch_info field to a method

This commit changes the language_data::la_language_arch_info 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_arch_info): Delete function, move
	implementation to...
	(ada_language::language_arch_info): ...here, a new member
	function.
	(ada_language_data): Delete la_language_arch_info.
	* c-lang.c (c_language_data): Likewise.
	(c_language::language_arch_info): New member function.
	(cplus_language_arch_info): Delete function, move
	implementation to...
	(cplus_language::language_arch_info): ...here, a new member
	function.
	(cplus_language_data): Delete la_language_arch_info.
	(asm_language_data): Likewise.
	(asm_language::language_arch_info): New member function.
	(minimal_language_data): Delete la_language_arch_info.
	(minimal_language::language_arch_info): New member function.
	* d-lang.c (d_language_arch_info): Delete function, move
	implementation to...
	(d_language::language_arch_info): ...here, a new member
	function.
	(d_language_data): Delete la_language_arch_info.
	* f-lang.c (f_language_arch_info): Delete function, move
	implementation to...
	(f_language::language_arch_info): ...here, a new member
	function.
	(f_language_data): Delete la_language_arch_info.
	* go-lang.c (go_language_arch_info): Delete function, move
	implementation to...
	(go_language::language_arch_info): ...here, a new member
	function.
	(go_language_data): Delete la_language_arch_info.
	* language.c (unknown_language_data): Likewise.
	(unknown_language::language_arch_info): New member function.
	(auto_language_data): Delete la_language_arch_info.
	(auto_language::language_arch_info): New member function.
	(language_gdbarch_post_init): Update call to
	la_language_arch_info.
	* language.h (language_data): Delete la_language_arch_info
	function pointer.
	(language_defn::language_arch_info): New function.
	* m2-lang.c (m2_language_arch_info): Delete function, move
	implementation to...
	(m2_language::language_arch_info): ...here, a new member
	function.
	(m2_language_data): Delete la_language_arch_info.
	* objc-lang.c (objc_language_arch_info): Delete function, move
	implementation to...
	(objc_language::language_arch_info): ...here, a new member
	function.
	(objc_language_data): Delete la_language_arch_info.
	* opencl-lang.c (opencl_language_arch_info): Delete function, move
	implementation to...
	(opencl_language::language_arch_info): ...here, a new member
	function.
	(opencl_language_data): Delete la_language_arch_info.
	* p-lang.c (pascal_language_arch_info): Delete function, move
	implementation to...
	(pascal_language::language_arch_info): ...here, a new member
	function.
	(pascal_language_data): Delete la_language_arch_info.
	* rust-lang.c (rust_language_arch_info): Delete function, move
	implementation to...
	(rust_language::language_arch_info): ...here, a new member
	function.
	(rust_language_data): Delete la_language_arch_info.