[interpreter, debugger] support debug breaks via bytecode array copy

test/mjsunit/ignition/debug-break.js

-// Copyright 2015 the V8 project authors. All rights reserved.
+// 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: --expose-debug-as debug
 
+var Debug = debug.Debug;
+
 var break_count = 0;
 var exception = null;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
-    var source_line = exec_state.frame(0).sourceLineText();
-    print(source_line);
-    exec_state.prepareStep(Debug.StepAction.StepIn);
     break_count++;
+    var line = exec_state.frame(0).sourceLineText();
+    assertTrue(line.indexOf(`B${break_count}`) > 0);
   } catch (e) {
     exception = e;
   }
 }
 
-var Debug = debug.Debug;
 Debug.setListener(listener);
 
+function g() {
+  throw 1;
+}
 
 function f() {
-  this.x = 1;
+  try {
+    g();                         // B1
+  } catch (e) {}
+  assertEquals(2, break_count);  // B2
+  return 1;                      // B3
 }
 
-function g() {
-  new f();
-}
+Debug.setBreakPoint(f, 2, 0);
+Debug.setBreakPoint(f, 4, 1);
+Debug.setBreakPoint(f, 5, 1);
 
-Debug.setBreakPoint(g, 6, Debug.BreakPositionAlignment.BreakPosition);
-print(Debug.showBreakPoints(g, undefined,
-      Debug.BreakPositionAlignment.BreakPosition));
+f();
 
-g();
+assertEquals(3, break_count);
+assertNull(exception);
+
 Debug.setListener(null);
-
-assertEquals(6, break_count);
-assertNull(exception);