Fill in a few more SSE/SSE2 insns, with current aim of being able to
run Qt-3.1 as built with "icc -xW" (P4 code generation).  Hopefully by
now I've worked through most SSE/SSE2 conceptual nasties, and it's
mostly a question of filling in the gaps.

I think I might have created a bug of some kind with SSE3g_RegWr.  My
current test app segfaults if I run without --optimise=no, which makes
me think I've written something erroneous in the UInstr predicates
controlling optimisation.  I don't know what though.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1676 a5019735-40e9-0310-863c-91ae7b9d1cf9
4 files changed