altivec.md (altivec_vpkpx): Handle little endian.

2013-07-24  Bill Schmidt  <wschmidt@linux.ibm.com>
	    Anton Blanchard <anton@au1.ibm.com>

	* config/rs6000/altivec.md (altivec_vpkpx): Handle little endian.
	(altivec_vpks<VI_char>ss): Likewise.
	(altivec_vpks<VI_char>us): Likewise.
	(altivec_vpku<VI_char>us): Likewise.
	(altivec_vpku<VI_char>um): Likewise.


Co-Authored-By: Anton Blanchard <anton@au1.ibm.com>

From-SVN: r201235