[AArch64] Merge SVE reduction patterns

[AArch64] Merge SVE reduction patterns

The reorg showed that we had an unnecessary separation between
the bitwise and max/min reductions for integers, and the
addition and max/min reductions for fp.

2019-08-07  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/iterators.md (BITWISEV): Delete.
	(SVE_INT_REDUCTION, SVE_FP_REDUCTION): New int iterators.
	(optab): Handle UNSPEC_UMAXV, UNSPEC_UMINV, UNSPEC_SMAXV,
	UNSPEC_SMINV, UNSPEC_FADDV, UNSPEC_FMAXNMV, UNSPEC_FMAXV,
	UNSPEC_FMINNMV, UNSPEC_FMINV.
	(bit_reduc_op): Delete.
	(sve_int_op): New int attribute.
	(sve_fp_op): Handle UNSPEC_FADDV, UNSPEC_FMAXNMV, UNSPEC_FMAXV,
	UNSPEC_FMINNMV, UNSPEC_FMINV.
	* config/aarch64/aarch64-sve.md
	(reduc_<MAXMINV:maxmin_uns>_scal_<SVE_I:mode>)
	(*reduc_<MAXMINV:maxmin_uns>_scal_<SVE_I:mode>)
	(reduc_<BITWISEV:optab>_scal_<SVE_I:mode>)
	(*reduc_<BITWISEV:optab>_scal_<SVE_I:mode>): Merge into...
	(reduc_<SVE_INT_REDUCTION:optab>_scal_<SVE_I:mode>)
	(*reduc_<SVE_INT_REDUCTION:optab>_scal_<SVE_I:mode>): ...these
	new patterns.
	(reduc_plus_scal_<SVE_F:mode>, *reduc_plus_scal_<SVE_I:mode>)
	(reduc_<FMAXMINV:optab>_scal_<SVE_F:mode>)
	(*reduc_<FMAXMINV:optab>_scal_<SVE_F:mode>): Merge into...
	(reduc_<SVE_FP_REDUCTION:optab>_scal_<SVE_F:mode>)
	(*reduc_<SVE_FP_REDUCTION:optab>_scal_<SVE_F:mode>): ...these
	new patterns.

From-SVN: r274190