[turbofan] Add support for copy-on-write element stores.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 6066b8b1fb8b93e33f77342c90e5ae2eb2054607..30908a75c7b5bc21d682421d046d6b9c1ae394f8 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -615,9 +615,10 @@ PipelineCompilationJob::Status PipelineCompilationJob::CreateGraphImpl() {
     if (!Compiler::EnsureDeoptimizationSupport(info())) return FAILED;
   }
 
-  // TODO(mstarzinger): Hack to ensure that the ToNumber call descriptor is
+  // TODO(mstarzinger): Hack to ensure that certain call descriptors are
   // initialized on the main thread, since it is needed off-thread by the
   // effect control linearizer.
+  CodeFactory::CopyFixedArray(info()->isolate());
   CodeFactory::ToNumber(info()->isolate());
 
   linkage_ = new (&zone_) Linkage(Linkage::ComputeIncoming(&zone_, info()));
@@ -1074,7 +1075,8 @@ struct LoadEliminationPhase {
     DeadCodeElimination dead_code_elimination(&graph_reducer, data->graph(),
                                               data->common());
     RedundancyElimination redundancy_elimination(&graph_reducer, temp_zone);
-    LoadElimination load_elimination(&graph_reducer, temp_zone);
+    LoadElimination load_elimination(&graph_reducer, data->jsgraph(),
+                                     temp_zone);
     ValueNumberingReducer value_numbering(temp_zone, data->graph()->zone());
     CommonOperatorReducer common_reducer(&graph_reducer, data->graph(),
                                          data->common(), data->machine());