freedreno/ir3: Add new synchronization opcodes

freedreno/ir3: Add new synchronization opcodes

There are two new opcodes in use in tesselation control shaders:
category 0, opcodes 13 and 15.  unk13 is a kill type of instruction
that terminates threads where !p0.x and it used to narrow down a patch
wavefront to just thread 0.  Then, once thread 0 has written the tess
levels, it issues unk15, which might signal the TE that another patch
has been fully written.

Signed-off-by: Kristian H. Kristensen <hoegsberg@google.com>
Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Rob Clark <robdclark@gmail.com>