[interpreter, debugger] abstraction for source position calculation.

test/mjsunit/ignition/stack-trace-source-position.js

Index: test/mjsunit/ignition/stack-trace-source-position.js
diff --git a/test/mjsunit/ignition/stack-trace-source-position.js b/test/mjsunit/ignition/stack-trace-source-position.js
new file mode 100644
index 0000000000000000000000000000000000000000..1c4079ab397c4819f9e51829638e36c5f6a8c089
--- /dev/null
+++ b/test/mjsunit/ignition/stack-trace-source-position.js
@@ -0,0 +1,13 @@
+// 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: --ignition --ignition-filter=f
+
+function f() {
+  return new Error().stack;
+}
+
+// TODO(yangguo): this is just a dummy source position calculated for
+// interpreter bytecode. Update this once something better comes along.
+assertTrue(/at f.*?:\d+:\d+/.test(f()));