[ARM] PR target/64600 Fix another ICE with -mtune=xscale: properly sign-extend mask during constant splitting

	PR target/64600
	* config/arm/arm.c (arm_gen_constant, AND case): Use
	ARM_SIGN_EXTEND when constructing AND mask.

	PR target/64600
	* gcc.target/arm/pr64600_1.c: New test.

From-SVN: r221413