intel/compiler: Add scheduler deps for instructions that implicitly read g0

Otherwise the scheduler can move the writes after the reads.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95009
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95012
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: Mark Janes <mark.a.janes@intel.com>
Cc: Clayton A Craft <clayton.a.craft@intel.com>
Cc: mesa-stable@lists.freedesktop.org

src/intel/compiler/brw_schedule_instructions.cpp

@@ -1267,6 +1267,9 @@ vec4_instruction_scheduler::calculate_deps()
          }
       }
 
+      if (inst->reads_g0_implicitly())
+         add_dep(last_fixed_grf_write, n);
+
       if (!inst->is_send_from_grf()) {
          for (int i = 0; i < inst->mlen; i++) {
             /* It looks like the MRF regs are released in the send