r600/asm: add LDS ops and barrier to the once per group restriction.
r600/asm: add LDS ops and barrier to the once per group restriction.

LDS ops must be scheduled in X slot, and barrier should be on its
own in a group.

Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler