Minor changes to how V{LD}{1,2,3,4} are tested:
* print the output 64-bit results in most-to-least-significant
  lane format
* change the memory values used in these tests to ones which
  are reliably able to detect confusion of 8-bit lanes.  The
  previous values couldn't to that reliable.  This change causes
  the diff to be huge because the stdout.exp changes a lot.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13374 a5019735-40e9-0310-863c-91ae7b9d1cf9