Make LTO's implementation of LANG_HOOKS_TYPE_FOR_SIZE the default

Make LTO's implementation of LANG_HOOKS_TYPE_FOR_SIZE the default

gcc/jit/ChangeLog:
	* dummy-frontend.c (jit_langhook_type_for_size): Delete.
	(LANG_HOOKS_TYPE_FOR_SIZE): Don't redefine.

gcc/ChangeLog:
	* langhooks-def.h (lhd_type_for_size): New decl.
	(LANG_HOOKS_TYPE_FOR_SIZE): Define as lhd_type_for_size.
	* langhooks.c (lhd_type_for_size): New function, taken from
	lto_type_for_size.

gcc/lto/ChangeLog:
	* lto-lang.c (builtin_type_for_size): Convert call to
	lto_type_for_size to one through the langhook.
	(lto_type_for_size): Move to langhooks.c and rename to
	lhd_type_for_size.
	(LANG_HOOKS_TYPE_FOR_SIZE): Don't redefine.

From-SVN: r244646