[debugger,compiler] do not recompile already compiled inner functions.

test/debugger/regress/regress-5575-2.js

Index: test/debugger/regress/regress-5575-2.js
diff --git a/test/debugger/regress/regress-5575-2.js b/test/debugger/regress/regress-5575-2.js
new file mode 100644
index 0000000000000000000000000000000000000000..0a27367f1bf3aa960c359a121ac16b7f3cee907e
--- /dev/null
+++ b/test/debugger/regress/regress-5575-2.js
@@ -0,0 +1,21 @@
+// 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.
+
+Debug = debug.Debug;
+
+Debug.setListener(function() {});
+
+function main() {
+  function* boo() {
+    debugger;
+    yield 42;
+  }
+
+  var gen = boo();
+  gen.next();
+  Debug.setBreakPoint(main, 0, 0);
+  gen.next();
+}
+
+main();