[i386]Migrate reduction optabs to reduc_<op>_scal

[i386]Migrate reduction optabs to reduc_<op>_scal

	* config/i386/sse.md (reduc_splus_v8df): Rename to...
	(reduc_plus_scal_v8df): ...here; reduce to temp and extract scalar.

	(reduc_splus_v4df): Rename to...
	(reduc_plus_scal_v4df): ...here; reduce to temp and extract scalar.

	(reduc_splus_v2df): Rename to...
	(reduc_plus_scal_v2df): ...here; reduce to temp and extract scalar.

	(reduc_splus_v16sf): Rename to...
	(reduc_plus_scal_v16sf): ...here; reduce to temp and extract scalar.

	(reduc_splus_v8sf): Rename to...
	(reduc_plus_scal_v8sf): ...here; reduce to temp and extract scalar.

	(reduc_splus_v4sf): Rename to...
	(reduc_plus_scal_v4sf): ...here; reduce to temp and extract scalar.

	(reduc_<code>_<mode>, all 3 variants): Rename each to...
	(reduc_<code>_scal_<mode>): ...here; reduce to temp and extract scalar.

	(reduc_umin_v8hf): Rename to...
	(reduc_umin_scal_v8hf): ...here; reduce to temp and extract scalar.

From-SVN: r230423