[strong] Implement strong property access semantics

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 62d88858144bd668be72f639010f0947daa56f18..d8aa6c565b0325e26697f6125fac00f878303822 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -331,6 +331,7 @@ class HGraph final : public ZoneObject {
   HConstant* GetConstantMinus1();
   HConstant* GetConstantTrue();
   HConstant* GetConstantFalse();
+  HConstant* GetConstantBool(bool value);
   HConstant* GetConstantHole();
   HConstant* GetConstantNull();
   HConstant* GetInvalidContext();
@@ -1352,9 +1353,9 @@ class HGraphBuilder {
                                     HValue* key);
 
   HValue* BuildUncheckedDictionaryElementLoad(HValue* receiver,
-                                              HValue* elements,
-                                              HValue* key,
-                                              HValue* hash);
+                                              HValue* elements, HValue* key,
+                                              HValue* hash,
+                                              LanguageMode language_mode);
 
   HValue* BuildRegExpConstructResult(HValue* length,
                                      HValue* index,