Revert of [turbofan] Optimize string "length" property access based on types.

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index 4c69c3747ec08507f9de2d2bd5680d7b41f0fe7c..051009dd6ea4b533f3b8a0b67b07467fb0a87d55 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -792,27 +792,6 @@
     Node* constant = jsgraph()->Constant(constant_value);
     ReplaceWithValue(node, constant);
     return Replace(constant);
-  }
-  return NoChange();
-}
-
-
-Reduction JSTypedLowering::ReduceJSLoadNamed(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSLoadNamed, node->opcode());
-  Node* receiver = NodeProperties::GetValueInput(node, 0);
-  Type* receiver_type = NodeProperties::GetBounds(receiver).upper;
-  Node* effect = NodeProperties::GetEffectInput(node);
-  Node* control = NodeProperties::GetControlInput(node);
-  Handle<Name> name = LoadNamedParametersOf(node->op()).name().handle();
-  // Optimize "length" property of strings.
-  if (name.is_identical_to(factory()->length_string()) &&
-      receiver_type->Is(Type::String())) {
-    Node* value = effect =
-        graph()->NewNode(simplified()->LoadField(
-                             AccessBuilder::ForStringLength(graph()->zone())),
-                         receiver, effect, control);
-    ReplaceWithValue(node, value, effect);
-    return Replace(value);
   }
   return NoChange();
 }
@@ -1642,8 +1621,6 @@
       return ReduceJSToString(node);
     case IrOpcode::kJSLoadGlobal:
       return ReduceJSLoadGlobal(node);
-    case IrOpcode::kJSLoadNamed:
-      return ReduceJSLoadNamed(node);
     case IrOpcode::kJSLoadProperty:
       return ReduceJSLoadProperty(node);
     case IrOpcode::kJSStoreProperty: