Ensure class prototype objects have the right Map::constructor field

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 0e2f97c8137407175c0c3aa845ccf22ed46312ad..14fb42a26ea8da7b033f8bbace22fef01c5e2595 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -24630,3 +24630,15 @@ TEST(GetPrototypeHidden) {
       "f()");
   CHECK(result->Equals(proto2));
 }
+
+
+TEST(ClassPrototypeCreationContext) {
+  i::FLAG_harmony_classes = true;
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope handle_scope(isolate);
+  LocalContext env;
+
+  Handle<Object> result = Handle<Object>::Cast(
+      CompileRun("'use strict'; class Example { }; Example.prototype"));
+  CHECK(env.local() == result->CreationContext());
+}