[interpreter] Fix peephole rule on eliding last before jump.

test/mjsunit/ignition/regress-629792-source-position-on-jump.js

 // 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 o = function() {};
-function f() {
-  var lit = { __proto__: o  };
-  o instanceof RegExp;
+function f(t) {
+  var f = t || this;
+  for (var i in t) {
+    for (var j in t) {
+      (j);
+      continue;
+    }
+  }
 }
 f();