sh.c (builtin_description): Add is_enabled member.

sh.c (builtin_description): Add is_enabled member.

	* config/sh/sh.c (builtin_description): Add is_enabled member.
	(shmedia_builtin_p): New function.
	(bdesc): Use shmedia_builtin_p for existing built-ins.
	(sh_media_init_builtins, sh_init_builtins): Merge into single function
	sh_init_builtins.  Add is_enabled checking.  Move variable declarations
	to where they are actually used.
	(sh_media_builtin_decl, sh_builtin_decl): Merge into single function
	sh_builtin_decl.  Add is_enabled checking.
	(sh_expand_builtin): Move variable declarations to where they are
	actually used.

From-SVN: r192142