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

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index 8252093d159d0f1c483594eb8bf04d227f85d432..920f644f28664829ab14682bfff206772dd4e3e2 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -42,6 +42,7 @@ class JSTypedLowering final : public AdvancedReducer {
   Reduction ReduceJSMultiply(Node* node);
   Reduction ReduceJSComparison(Node* node);
   Reduction ReduceJSLoadGlobal(Node* node);
+  Reduction ReduceJSLoadNamed(Node* node);
   Reduction ReduceJSLoadProperty(Node* node);
   Reduction ReduceJSStoreProperty(Node* node);
   Reduction ReduceJSLoadContext(Node* node);