re PR target/78594 (Bug in November 11th, 2016 change to rs6000.md)

2016-11-29  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/78594
	* config/rs6000/rs6000.md (mov<mode>_internal, QHI iterator): Add
	'x' to stxsi<wd>x print pattern, so that QImode and HImode values
	residing in traditional altivec registers can be stored
	correctly.

From-SVN: r242983