[ARM] Migrate to new reduc_[us](min|max)_scal_optab

[ARM] Migrate to new reduc_[us](min|max)_scal_optab

	config/arm/neon.md (reduc_smin_<mode> *2): Rename to...
	(reduc_smin_scal_<mode> *2): ...this; extract scalar result.
	(reduc_smax_<mode> *2): Rename to...
	(reduc_smax_scal_<mode> *2): ...this; extract scalar result.
	(reduc_umin_<mode> *2): Rename to...
	(reduc_umin_scal_<mode> *2): ...this; extract scalar result.
	(reduc_umax_<mode> *2): Rename to...
	(reduc_umax_scal_<mode> *2): ...this; extract scalar result.

From-SVN: r217080