gallivm: add major integer opcodes to the tgsi action handler

gallivm: add major integer opcodes to the tgsi action handler

This adds support for all the opcodes needed for native integer
support with GLSL 1.20 enabled, and some of the ones for GLSL1.30
support.

I've split them between non-cpu and cpu along the same lines
Tom's code did for the other ones I think, but I'm open to review
on which ones should go where.

With instance ids fixed I get no regressions on my box here
with LLVM 2.8, will test with later LLVMs as well.

Signed-off-by: Dave Airlie <airlied@redhat.com>