backport: re PR c/89520 (ICE tree check: accessed operand 4 of call_expr with 3 opera...

backport: re PR c/89520 (ICE tree check: accessed operand 4 of call_expr with 3 operands in convert_to_integer_1, at convert.c:668)

	Backported from mainline
	2019-02-28  Jakub Jelinek  <jakub@redhat.com>

	PR c/89520
	* convert.c (convert_to_real_1, convert_to_integer_1): Punt for
	builtins if they don't have a single scalar floating point argument.
	Formatting fixes.

	* gcc.dg/pr89520-1.c: New test.
	* gcc.dg/pr89520-2.c: New test.

From-SVN: r270717