* tree.h (unsave_expr_1): New function.
	(lang_unsave): New variable.
	(get_callee_fndecl): New function.
	* tree.c (unsave_expr_now_r): New function.
	(lang_unsave): Define.
	(unsave_expr_1): Likewise.
	(unsave_expr_now_r): Split out from unsave_expr_now.
	(unsave_expr_now): Call lang_unsave if it is non-NULL.  Otherwise,
	call unsave_expr_now_r.
	(get_callee_fndecl): Define.

From-SVN: r30646