rs6000.c (vspltis_constant): Correct for little-endian.

rs6000.c (vspltis_constant): Correct for little-endian.

gcc/
	* config/rs6000/rs6000.c (vspltis_constant): Correct for little-endian.
	(gen_easy_altivec_constant): Likewise.
	* config/rs6000/predicates.md (easy_vector_constant_add_self,
	easy_vector_constant_msb): Likewise.
gcc/testsuite/
	* gcc.target/powerpc/altivec-consts.c: Correct for little-endian.
	Add scan-assembler-not "lvx".
	* gcc.target/powerpc/le-altivec-consts.c: New.

From-SVN: r200357