invoke.texi: Add -maltivec={be,le} options...

invoke.texi: Add -maltivec={be,le} options...

2014-01-09  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* doc/invoke.texi: Add -maltivec={be,le} options, and document
	default element-order behavior for -maltivec.
	* config/rs6000/rs6000.opt: Add -maltivec={be,le} options.
	* config/rs6000/rs6000.c (rs6000_option_override_internal): Ensure
	that -maltivec={le,be} implies -maltivec; disallow -maltivec=le
	when targeting big endian, at least for now.
	* config/rs6000/rs6000.h: Add #define of VECTOR_ELT_ORDER_BIG.

From-SVN: r206494