builtins.c (expand_builtin_mathfn): Rearrange so that we only return 0 for invalid...

builtins.c (expand_builtin_mathfn): Rearrange so that we only return 0 for invalid argument types.

	* builtins.c (expand_builtin_mathfn):  Rearrange so that we only
	return 0 for invalid argument types.  Instead drop through to a
	call of expand_call at the bottom of function.  If op is SQRT,
	try attaching a SQRT rtx as the REQ_EQUAL note of the libcall.

From-SVN: r70792