Add a little_endian reference output entry for the 2007-01-07-lvsl-lvsr-Regression test.
This should resolve the currently failing test on the ppc64le bot, which is showing as
/home/buildbots/ppc64le-clanglnt/clang-lnt-ppc64le-1/tests/nt/build/sample-0/tools/fpcmp: Compared: 1.020304e+17 and 4.030201e+15