[ic] Don't enable property cell mode for a LoadGlobalIC if the holder is a different global object …

test/cctest/test-global-object.cc

Index: test/cctest/test-global-object.cc
diff --git a/test/cctest/test-global-object.cc b/test/cctest/test-global-object.cc
index d6713208bf433598c8960b82f27c8665e4d969e7..4bcb2b17fcfe6cf70bbeac38e8f7d27618648c66 100644
--- a/test/cctest/test-global-object.cc
+++ b/test/cctest/test-global-object.cc
@@ -105,3 +105,30 @@ TEST(KeysGlobalObject_Regress2764) {
       Local<Array>::Cast(CompileRun("Object.getOwnPropertyNames(global2)"));
   CHECK_EQ(0u, result->Length());
 }
+
+TEST(KeysGlobalObject_SetPrototype) {
+  LocalContext env1;
+  v8::HandleScope scope(env1->GetIsolate());
+
+  // Create second environment.
+  v8::Local<Context> env2 = Context::New(env1->GetIsolate());
+
+  Local<Value> token = v8_str("foo");
+
+  // Set same security token for env1 and env2.
+  env1->SetSecurityToken(token);
+  env2->SetSecurityToken(token);
+
+  // Create a reference to env2 global from env1 global.
+  env1->Global()
+      ->GetPrototype()
+      .As<v8::Object>()
+      ->SetPrototype(env1.local(), env2->Global()->GetPrototype())
+      .FromJust();
+  // Set some global variables in global2
+  env2->Global()->Set(env2, v8_str("a"), v8_str("a")).FromJust();
+  env2->Global()->Set(env2, v8_str("42"), v8_str("42")).FromJust();
+
+  // List all entries from global2.
+  ExpectTrue("a == 'a'");
+}