[strong] Implement strong mode restrictions on property access

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index e9545c9592484ad9c92a1a0a63a816fc7b1c9ffd..40c5f7d01596a4d10b2bf8ccefaed0b5927be326 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -223,10 +223,15 @@ class LoadNamedParameters final {
  public:
   LoadNamedParameters(const Unique<Name>& name,
                       const ResolvedFeedbackSlot& feedback,
+                      LanguageMode language_mode,
                       ContextualMode contextual_mode)
-      : name_(name), feedback_(feedback), contextual_mode_(contextual_mode) {}
+      : name_(name),
+        feedback_(feedback),
+        language_mode_(language_mode),
+        contextual_mode_(contextual_mode) {}
 
   const Unique<Name>& name() const { return name_; }
+  LanguageMode language_mode() const { return language_mode_; }
   ContextualMode contextual_mode() const { return contextual_mode_; }
 
   const ResolvedFeedbackSlot& feedback() const { return feedback_; }
@@ -234,6 +239,7 @@ class LoadNamedParameters final {
  private:
   const Unique<Name> name_;
   const ResolvedFeedbackSlot feedback_;
+  const LanguageMode language_mode_;
   const ContextualMode contextual_mode_;
 };
 
@@ -251,13 +257,17 @@ const LoadNamedParameters& LoadNamedParametersOf(const Operator* op);
 // used as a parameter by JSLoadProperty operators.
 class LoadPropertyParameters final {
  public:
-  explicit LoadPropertyParameters(const ResolvedFeedbackSlot& feedback)
-      : feedback_(feedback) {}
+  explicit LoadPropertyParameters(const ResolvedFeedbackSlot& feedback,
+                                  LanguageMode language_mode)
+      : feedback_(feedback), language_mode_(language_mode) {}
 
   const ResolvedFeedbackSlot& feedback() const { return feedback_; }
 
+  LanguageMode language_mode() const { return language_mode_; }
+
  private:
   const ResolvedFeedbackSlot feedback_;
+  const LanguageMode language_mode_;
 };
 
 bool operator==(LoadPropertyParameters const&, LoadPropertyParameters const&);
@@ -368,9 +378,11 @@ class JSOperatorBuilder final : public ZoneObject {
 
   const Operator* CallConstruct(int arguments);
 
-  const Operator* LoadProperty(const ResolvedFeedbackSlot& feedback);
+  const Operator* LoadProperty(const ResolvedFeedbackSlot& feedback,
+                               LanguageMode language_mode);
   const Operator* LoadNamed(const Unique<Name>& name,
                             const ResolvedFeedbackSlot& feedback,
+                            LanguageMode language_mode,
                             ContextualMode contextual_mode = NOT_CONTEXTUAL);
 
   const Operator* StoreProperty(LanguageMode language_mode);