Correctly materialize arguments object in Runtime_DebugEvaluate.

test/mjsunit/regress/regress-crbug-222893.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --expose-debug-as debug
 
-Debug = debug.Debug;
+Debug = debug.Debug
+
+var error = null;
+var array = ["a", "b", "c"];
 
 function listener(event, exec_state, event_data, data) {
-  if (event == Debug.DebugEvent.Break) {
-    exec_state.prepareStep(Debug.StepAction.StepNext, 10);
+  try {
+    if (event == Debug.DebugEvent.Break) {
+      assertArrayEquals(array,
+                        exec_state.frame(0).evaluate('arguments').value());
+    }
+  } catch (e) {
+    error = e;
   }
 };
 
 Debug.setListener(listener);
 
-var statement = "";
-for (var i = 0; i < 1024; i++) statement += "z";
-statement = 'with(0)' + statement + '=function foo(){}';
 
-debugger;
-eval(statement);
+(function(a, b) {
+  arguments;
+  debugger;  // Arguments is already materialized.
+}).apply(this, array);
+assertNull(error);
+
+(function(a, b) {
+  debugger;  // Arguments is not yet materialized.
+}).apply(this, array);
+assertNull(error);
+