[interpreter] source positions should not be emitted for dead code.

test/mjsunit/ignition/dead-code-source-position.js

Index: test/mjsunit/ignition/dead-code-source-position.js
diff --git a/test/message/arrow-invalid-rest.js b/test/mjsunit/ignition/dead-code-source-position.js
similarity index 74%
copy from test/message/arrow-invalid-rest.js
copy to test/mjsunit/ignition/dead-code-source-position.js
index 870dbe9f542ea95050514227feaf9b2299ca516d..95bb9183b880229a703e58503e9aec2a673015aa 100644
--- a/test/message/arrow-invalid-rest.js
+++ b/test/mjsunit/ignition/dead-code-source-position.js
@@ -1,8 +1,9 @@
 // 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.
-//
-//
 
-var f = (...x = 10) => x;
-f(1, 2, 3, 4, 5);
+function f() {
+  for (f(x) in []) { f(new f()) }
+}
+
+f();