The PR shows the compiler crashing with -mvsx -mlittle -O0.  This turns
out to be caused by a failure to make of the higher bits in an index
endian conversion.

2020-04-24  Segher Boessenkool  <segher@kernel.crashing.org>

	PR target/94710
	* config/rs6000/vector.md (vec_shr_<mode> for VEC_L): Correct little
	endian byteshift_val calculation.