builtins.c (expand_builtin_mathfn): Wrap argument in save_expr directly instead of re-building the call.

2007-08-23  Richard Guenther  <rguenther@suse.de>

	* builtins.c (expand_builtin_mathfn): Wrap argument in
	save_expr directly instead of re-building the call.
	(expand_builtin_mathfn_2): Likewise.
	(expand_builtin_mathfn_3): Likewise.
	(expand_builtin_interclass_mathfn): Likewise.
	(expand_builtin_int_roundingfn): Set arg.
	(expand_builtin_int_roundingfn_2): Likewise.

From-SVN: r127740