Revert of Revert of [strong] Implement strong mode restrictions on property access

src/compiler/js-operator.cc

Index: src/compiler/js-operator.cc
diff --git a/src/compiler/js-operator.cc b/src/compiler/js-operator.cc
index 83bf5573811841044b7d9ff3386435b97641c8f3..8a2c6fe269315c504e15a60115fd1e9fe7729f38 100644
--- a/src/compiler/js-operator.cc
+++ b/src/compiler/js-operator.cc
@@ -190,6 +190,7 @@
 bool operator==(LoadNamedParameters const& lhs,
                 LoadNamedParameters const& rhs) {
   return lhs.name() == rhs.name() &&
+         lhs.language_mode() == rhs.language_mode() &&
          lhs.contextual_mode() == rhs.contextual_mode() &&
          lhs.feedback() == rhs.feedback();
 }
@@ -202,24 +203,26 @@
 
 
 size_t hash_value(LoadNamedParameters const& p) {
-  return base::hash_combine(p.name(), p.contextual_mode(), p.feedback());
+  return base::hash_combine(p.name(), p.language_mode(), p.contextual_mode(),
+                            p.feedback());
 }
 
 
 std::ostream& operator<<(std::ostream& os, LoadNamedParameters const& p) {
-  return os << Brief(*p.name().handle()) << ", " << p.contextual_mode();
+  return os << Brief(*p.name().handle()) << ", " << p.language_mode() << ", "
+            << p.contextual_mode();
 }
 
 
 std::ostream& operator<<(std::ostream& os, LoadPropertyParameters const& p) {
-  // Nothing special to print.
-  return os;
+  return os << p.language_mode();
 }
 
 
 bool operator==(LoadPropertyParameters const& lhs,
                 LoadPropertyParameters const& rhs) {
-  return lhs.feedback() == rhs.feedback();
+  return lhs.language_mode() == rhs.language_mode() &&
+         lhs.feedback() == rhs.feedback();
 }
 
 
@@ -236,7 +239,7 @@
 
 
 size_t hash_value(LoadPropertyParameters const& p) {
-  return hash_value(p.feedback());
+  return base::hash_combine(p.language_mode(), p.feedback());
 }
 
 
@@ -459,8 +462,9 @@
 
 const Operator* JSOperatorBuilder::LoadNamed(
     const Unique<Name>& name, const ResolvedFeedbackSlot& feedback,
-    ContextualMode contextual_mode) {
-  LoadNamedParameters parameters(name, feedback, contextual_mode);
+    LanguageMode language_mode, ContextualMode contextual_mode) {
+  LoadNamedParameters parameters(name, feedback, language_mode,
+                                 contextual_mode);
   return new (zone()) Operator1<LoadNamedParameters>(   // --
       IrOpcode::kJSLoadNamed, Operator::kNoProperties,  // opcode
       "JSLoadNamed",                                    // name
@@ -470,8 +474,8 @@
 
 
 const Operator* JSOperatorBuilder::LoadProperty(
-    const ResolvedFeedbackSlot& feedback) {
-  LoadPropertyParameters parameters(feedback);
+    const ResolvedFeedbackSlot& feedback, LanguageMode language_mode) {
+  LoadPropertyParameters parameters(feedback, language_mode);
   return new (zone()) Operator1<LoadPropertyParameters>(   // --
       IrOpcode::kJSLoadProperty, Operator::kNoProperties,  // opcode
       "JSLoadProperty",                                    // name