[strong] Implement strong mode restrictions on property access

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 9eaef252e6822a12ed6db8b5b8f1191e49733d6c..1ba40f946df5322d1c082728e4d7e00f10140b95 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -341,8 +341,8 @@ void JSGenericLowering::LowerJSToObject(Node* node) {
 void JSGenericLowering::LowerJSLoadProperty(Node* node) {
   CallDescriptor::Flags flags = AdjustFrameStatesForCall(node);
   const LoadPropertyParameters& p = LoadPropertyParametersOf(node->op());
-  Callable callable =
-      CodeFactory::KeyedLoadICInOptimizedCode(isolate(), UNINITIALIZED);
+  Callable callable = CodeFactory::KeyedLoadICInOptimizedCode(
+      isolate(), p.language_mode(), UNINITIALIZED);
   node->InsertInput(zone(), 2, jsgraph()->SmiConstant(p.feedback().index()));
   node->InsertInput(zone(), 3, jsgraph()->HeapConstant(p.feedback().vector()));
   ReplaceWithStubCall(node, callable,
@@ -354,7 +354,7 @@ void JSGenericLowering::LowerJSLoadNamed(Node* node) {
   CallDescriptor::Flags flags = AdjustFrameStatesForCall(node);
   const LoadNamedParameters& p = LoadNamedParametersOf(node->op());
   Callable callable = CodeFactory::LoadICInOptimizedCode(
-      isolate(), p.contextual_mode(), UNINITIALIZED);
+      isolate(), p.contextual_mode(), p.language_mode(), UNINITIALIZED);
   node->InsertInput(zone(), 1, jsgraph()->HeapConstant(p.name()));
   node->InsertInput(zone(), 2, jsgraph()->SmiConstant(p.feedback().index()));
   node->InsertInput(zone(), 3, jsgraph()->HeapConstant(p.feedback().vector()));