Insert materialized context at the right place in DebugEvaluate.

test/mjsunit/regress/regress-crbug-323936.js

+// Copyright 2014 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: --expose-debug-as debug
+
+Debug = debug.Debug;
+
+var step = 0;
+var exception = null;
+
+function listener(event, exec_state, event_data, data) {
+  if (event != Debug.DebugEvent.Break) return;
+  try {
+    if (step == 0) {
+      assertEquals("Error", exec_state.frame(0).evaluate("e").value());
+      exec_state.frame(0).evaluate("e = 'foo'");

[aandrey, 2014/09/25 06:19:06]

Below is the check that changes above materialized_context gets written back.

exec_state.frame(0).evaluate("x = 'modified'");

+    } else {
+      assertEquals("Argument", exec_state.frame(0).evaluate("e").value());
+      exec_state.frame(0).evaluate("e = 'bar'");
+    }
+    step++;
+  } catch (e) {
+    print(e + e.stack);
+    exception = e;
+  }
+}
+
+Debug.setListener(listener);
+
+function f(e) {

[aandrey, 2014/09/25 06:19:06]

f(e, x)

+  try {
+    throw "Error";
+  } catch(e) {
+    debugger;
+    assertEquals("foo", e);
+  }
+  debugger;
+  assertEquals("bar", e);

[aandrey, 2014/09/25 06:19:06]

assertEquals("modified", x);

+}
+
+f("Argument")
+assertNull(exception);
+assertEquals(2, step);