c-decl.c (builtin_decls): Replace with first_builtin_decl and last_builtin_decl.

c-decl.c (builtin_decls): Replace with first_builtin_decl and last_builtin_decl.

	* c-decl.c (builtin_decls): Replace with first_builtin_decl
	and last_builtin_decl.
	(c_init_decl_processing): Initialize both.
	(c_reset_state): Iterate from first_builtin_decl to
	last_builtin_decl inclusive to reintroduce builtins.

From-SVN: r70218