Ensure that allocation sinking candidates are classified as not-aliased before final load forwardin…

runtime/vm/flow_graph_optimizer.cc

Index: runtime/vm/flow_graph_optimizer.cc
diff --git a/runtime/vm/flow_graph_optimizer.cc b/runtime/vm/flow_graph_optimizer.cc
index 36646d3fbd7d7012cf077c0a58c6865f0f37b542..e5d344035c685752d6e39bcc1b78d8b84f6f7b76 100644
--- a/runtime/vm/flow_graph_optimizer.cc
+++ b/runtime/vm/flow_graph_optimizer.cc
@@ -6422,6 +6422,13 @@ void AllocationSinking::Optimize() {
           OS::Print("discovered allocation sinking candidate: v%"Pd"\n",
                     alloc->ssa_temp_index());
         }
+
+        if (alloc->identity() == AllocateObjectInstr::kAliased) {
+          // Allocation might have been classified as aliased earlier due to
+          // some operations that are now eliminated.
+          alloc->set_identity(AllocateObjectInstr::kNotAliased);
+        }
+
         candidates.Add(alloc);
       }
     }