[strong] Implement strong mode restrictions on property access

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 1ef6cbae011746cc35ac887221b7b2a9ed73af68..e40f2146031e6d358d3503d80f0e779376c2e97c 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -78,8 +78,8 @@ namespace internal {
   F(DefineClass, 6, 1)                        \
   F(DefineClassMethod, 3, 1)                  \
   F(ClassGetSourceCode, 1, 1)                 \
-  F(LoadFromSuper, 3, 1)                      \
-  F(LoadKeyedFromSuper, 3, 1)                 \
+  F(LoadFromSuper, 4, 1)                      \
+  F(LoadKeyedFromSuper, 4, 1)                 \
   F(StoreToSuper_Strict, 4, 1)                \
   F(StoreToSuper_Sloppy, 4, 1)                \
   F(StoreKeyedToSuper_Strict, 4, 1)           \
@@ -430,8 +430,8 @@ namespace internal {
   F(OptimizeObjectForAddingMultipleProperties, 2, 1) \
   F(ObjectFreeze, 1, 1)                              \
   F(ObjectSeal, 1, 1)                                \
-  F(GetProperty, 2, 1)                               \
-  F(KeyedGetProperty, 2, 1)                          \
+  F(GetProperty, 3, 1)                               \
+  F(KeyedGetProperty, 3, 1)                          \
   F(AddNamedProperty, 4, 1)                          \
   F(SetProperty, 4, 1)                               \
   F(AddElement, 4, 1)                                \
@@ -816,7 +816,8 @@ class Runtime : public AllStatic {
   // Support getting the characters in a string using [] notation as
   // in Firefox/SpiderMonkey, Safari and Opera.
   MUST_USE_RESULT static MaybeHandle<Object> GetElementOrCharAt(
-      Isolate* isolate, Handle<Object> object, uint32_t index);
+      Isolate* isolate, Handle<Object> object, uint32_t index,
+      Strength strength = Strength::WEAK);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetObjectProperty(
       Isolate* isolate, Handle<Object> object, Handle<Object> key,
@@ -827,7 +828,12 @@ class Runtime : public AllStatic {
       PropertyAttributes attr);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetObjectProperty(
-      Isolate* isolate, Handle<Object> object, Handle<Object> key);
+      Isolate* isolate, Handle<Object> object, Handle<Object> key,
+      Strength strength = Strength::WEAK);
+
+  MUST_USE_RESULT static MaybeHandle<Object> KeyedGetObjectProperty(
+      Isolate* isolate, Handle<Object> receiver_obj, Handle<Object> key_obj,
+      Strength strength);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetPrototype(
       Isolate* isolate, Handle<Object> object);