[ARM] PR 65694: Properly sign-extend large numbers before passing to GEN_INT in arm_canonicalize_comparison

	PR target/65694
	* config/arm/arm.c (arm_canonicalize_comparison): Use ARM_SIGN_EXTEND
	when creating +1 values for SImode.

	PR target/65694
	* g++.dg/torture/pr65694.C: New test.

From-SVN: r221976