* lib/target-supports.exp (check_effective_target_arm_dsp): New.
	* gcc.target/arm/mla-2.c: Use it instead of specific -march.
	* gcc.target/arm/wmul-1.c: Likewise.
	* gcc.target/arm/wmul-2.c: Likewise.
	* gcc.target/arm/wmul-3.c: Likewise.
	* gcc.target/arm/wmul-4.c: Likewise.
	* gcc.target/arm/smlaltb-1.c: Require arm_dsp, don't specify -march,
	add tab after scan target.
	* gcc.target/arm/smlaltt-1.c: Likewise.
	* gcc.target/arm/smlatb-1.c: Likewise.
	* gcc.target/arm/smlatt-1.c: Likewise.

From-SVN: r175993