[turbofan] Support for ConsString by escape analysis.

src/deoptimizer.cc

Index: src/deoptimizer.cc
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index 94e228eff495ca97577134b6af53ab8944cc410b..a6ac7dc133b4a3c1ac9307e98b7bac4b33ccdb05 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -3803,6 +3803,24 @@ Handle<Object> TranslatedState::MaterializeAt(int frame_index,
           CHECK(next_link->IsUndefined(isolate_));
           return object;
         }
+        case CONS_STRING_TYPE: {
+          Handle<ConsString> object = Handle<ConsString>::cast(
+              isolate_->factory()
+                  ->NewConsString(isolate_->factory()->undefined_string(),
+                                  isolate_->factory()->undefined_string())
+                  .ToHandleChecked());
+          slot->value_ = object;
+          Handle<Object> hash = MaterializeAt(frame_index, value_index);
+          Handle<Object> length = MaterializeAt(frame_index, value_index);
+          Handle<Object> first = MaterializeAt(frame_index, value_index);
+          Handle<Object> second = MaterializeAt(frame_index, value_index);
+          object->set_map(*map);
+          object->set_length(Smi::cast(*length)->value());
+          object->set_first(String::cast(*first));
+          object->set_second(String::cast(*second));
+          CHECK(hash->IsNumber());  // The {Name::kEmptyHashField} value.
+          return object;
+        }
         case CONTEXT_EXTENSION_TYPE: {
           Handle<ContextExtension> object =
               isolate_->factory()->NewContextExtension(