Do not implicitly convert non-object receivers for strict mode functions.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 5fe1f9dc5bcb33a93581e2f2ed100d58cfe5c5f0..368f698d12afb8ae6945105d78b3d5186fce029a 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -2059,6 +2059,24 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_SpecialArrayFunctions) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_IsClassicModeFunction) {
+  NoHandleAllocation ha(isolate);
+  ASSERT(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSReceiver, callable, 0);
+  if (!callable->IsJSFunction()) {
+    HandleScope scope(isolate);
+    bool threw = false;
+    Handle<Object> delegate =
+        Execution::TryGetFunctionDelegate(Handle<JSReceiver>(callable), &threw);
+    if (threw) return Failure::Exception();
+    callable = JSFunction::cast(*delegate);
+  }
+  JSFunction* function = JSFunction::cast(callable);
+  SharedFunctionInfo* shared = function->shared();
+  return isolate->heap()->ToBoolean(shared->is_classic_mode());
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_GetDefaultReceiver) {
   NoHandleAllocation ha(isolate);
   ASSERT(args.length() == 1);