[Interpreter] Ensure that a function is compiled before tiering up to baseline.

test/mjsunit/ignition/regress-5768.js

Index: test/mjsunit/ignition/regress-5768.js
diff --git a/test/mjsunit/ignition/regress-5768.js b/test/mjsunit/ignition/regress-5768.js
new file mode 100644
index 0000000000000000000000000000000000000000..26f153966c38ba7d9f70b4f9c8383d24782d30d3
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+++ b/test/mjsunit/ignition/regress-5768.js
@@ -0,0 +1,16 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+var a = 0;
+function f() {
+  // access a global variable to trigger the use of
+  // typefeedback vector.
+  return a;
+}
+%BaselineFunctionOnNextCall(f)
+// We try to baseline a function that was not compiled before.
+// It should setup the typefeedback data correctly.
+f();