[arm][3/X] Implement __smla* intrinsics (Q-setting)

[arm][3/X] Implement __smla* intrinsics (Q-setting)

This patch implements some more Q-setting intrinsics form the SMLA* group.
These can set the saturation bit on overflow in the accumulation step.
Like earlier, these have non-Q-setting RTL forms as well for when the
Q-bit read
is not needed.

	* config/arm/arm.md (arm_smlabb_setq): New define_insn.
	(arm_smlabb): New define_expand.
	(*maddhisi4tb): Rename to...
	(maddhisi4tb): ... This.
	(*maddhisi4tt): Rename to...
	(maddhisi4tt): ... This.
	(arm_smlatb_setq): New define_insn.
	(arm_smlatb): New define_expand.
	(arm_smlatt_setq): New define_insn.
	(arm_smlatt): New define_expand.
	(arm_<smlaw_op><add_clobber_name>_insn): New define_insn.
	(arm_<smlaw_op>): New define_expand.
	* config/arm/arm_acle.h (__smlabb, __smlatb, __smlabt, __smlatt,
	__smlawb, __smlawt): Define.
	* config/arm_acle_builtins.def: Define builtins for the above.
	* config/arm/iterators.md (SMLAWBT): New int_iterator.
	(slaw_op): New int_attribute.
	* config/arm/unspecs.md (UNSPEC_SMLAWB, UNSPEC_SMLAWT): Define.

	* gcc.target/arm/acle/dsp_arith.c: Update test.

From-SVN: r277916