Do not mark phi-operands as live-out from predecessor.

runtime/vm/flow_graph_allocator.cc

Index: runtime/vm/flow_graph_allocator.cc
diff --git a/runtime/vm/flow_graph_allocator.cc b/runtime/vm/flow_graph_allocator.cc
index 156b03550fb8fed1fa5e40b03320c6f134cd5350..c958a2d2aac5282273bb0af96f9d5234d2350d17 100644
--- a/runtime/vm/flow_graph_allocator.cc
+++ b/runtime/vm/flow_graph_allocator.cc
@@ -127,15 +127,6 @@ void FlowGraphAllocator::ComputeInitialSets() {
           if (phi == NULL) continue;
           kill->Add(phi->ssa_temp_index());
           live_in->Remove(phi->ssa_temp_index());
-
-          for (intptr_t k = 0; k < phi->InputCount(); k++) {
-            Value* val = phi->InputAt(k);
-            if (val->IsUse()) {
-              BlockEntryInstr* pred = block->PredecessorAt(k);
-              const intptr_t use = val->AsUse()->definition()->ssa_temp_index();
-              live_out_[pred->postorder_number()]->Add(use);
-            }
-          }
         }
       }
     }