This adds guards to genmatch generated code before accessing call
expression or stmt arguments that might be out of bounds when
the user provided bogus prototypes for what we consider builtins.

2020-02-05  Richard Biener  <rguenther@suse.de>

	PR middle-end/90648
	* genmatch.c (dt_node::gen_kids_1): Emit number of argument
	checks before matching calls.

	* gcc.dg/pr90648.c: New testcase.