explow.c (compute_stack_clash_protection_loop_data): Use CONST_INT_P instead of expli...

explow.c (compute_stack_clash_protection_loop_data): Use CONST_INT_P instead of explicit test.

	* explow.c (compute_stack_clash_protection_loop_data): Use
	CONST_INT_P instead of explicit test.  Verify object is a
	CONST_INT_P before looking at INTVAL.
	(anti_adjust_stack_and_probe_stack_clash): Use CONST_INT_P
	instead of explicit test.

	* gcc.target/i386/stack-check-11.c: Update test and regexp
	so that it works for both i?86 and x86_64.

From-SVN: r253034