re PR debug/86194 (ICE: SIGSEGV in avoid_constant_pool_reference (simplify-rtx.c:215) with -O -g -mavx512bw)

	PR debug/86194
	* var-tracking.c (use_narrower_mode_test): Check if shift amount can
	be narrowed.

	* gcc.target/i386/pr86194.c: New test.

From-SVN: r261807