re PR middle-end/43730 (internal compiler error: in expand_builtin_interclass_mathfn, at builtins.c:2313)

	PR middle-end/43730
	* builtins.c (expand_builtin_interclass_mathfn): Also create
	a register if the predicate doesn't match.

testsuite/
	* gcc.dg/pr43730.c: New test.

From-SVN: r158268