Revert r19409: "Allow ICs to be generated for own global proxy."

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 0cc0d094e16a568b1abccc9b802dcb226371bc97..4cdc073f3760971b5e41a808b8ce4e92049d91dd 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -927,8 +927,7 @@ bool Object::IsJSGlobalProxy() {
   bool result = IsHeapObject() &&
                 (HeapObject::cast(this)->map()->instance_type() ==
                  JS_GLOBAL_PROXY_TYPE);
-  ASSERT(!result ||
-         HeapObject::cast(this)->map()->is_access_check_needed());
+  ASSERT(!result || IsAccessCheckNeeded());
   return result;
 }
 
@@ -953,14 +952,8 @@ bool Object::IsUndetectableObject() {
 
 
 bool Object::IsAccessCheckNeeded() {
-  if (!IsHeapObject()) return false;
-  if (IsJSGlobalProxy()) {
-    JSGlobalProxy* proxy = JSGlobalProxy::cast(this);
-    GlobalObject* global =
-        proxy->GetIsolate()->context()->global_object();
-    return proxy->IsDetachedFrom(global);
-  }
-  return HeapObject::cast(this)->map()->is_access_check_needed();
+  return IsHeapObject()
+    && HeapObject::cast(this)->map()->is_access_check_needed();
 }