aco: don't schedule instructions through depending VMEM instructions

Previously, the scheduler tried to move up instructions from below depending
VMEM instructions only to move them down again when scheduling the VMEM
instruction.

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>

src/amd/compiler/aco_scheduler.cpp

@@ -336,6 +336,9 @@ void schedule_SMEM(sched_ctx& ctx, Block* block,
       /* check if candidate depends on current */
       bool is_dependency = std::any_of(candidate->operands.begin(), candidate->operands.end(),
                                        [&ctx](const Operand& op) { return op.isTemp() && ctx.depends_on[op.tempId()];});
+      /* no need to steal from following VMEM instructions */
+      if (is_dependency && candidate->isVMEM())
+         break;
       if (moving_spill && is_spill_reload(candidate))
          is_dependency = true;
       if ((moving_interaction & barrier_shared) && candidate->format == Format::DS)