Make debugger step into bound callbacks passed to Array.forEach.

src/array.js

Index: src/array.js
diff --git a/src/array.js b/src/array.js
index 12d2b4c22ae73127236c6e3c189a1e4eec7bf888..62f9073fb11da599746ba028c984434d08a9281e 100644
--- a/src/array.js
+++ b/src/array.js
@@ -1156,7 +1156,7 @@ function ArrayFilter(f, receiver) {
   var accumulator = new InternalArray();
   var accumulator_length = 0;
   var is_array = IS_ARRAY(array);
-  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
+  var stepping = DEBUG_IS_STEPPING();
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
@@ -1192,7 +1192,7 @@ function ArrayForEach(f, receiver) {
   }
 
   var is_array = IS_ARRAY(array);
-  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
+  var stepping = DEBUG_IS_STEPPING();
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
@@ -1226,7 +1226,7 @@ function ArraySome(f, receiver) {
   }
 
   var is_array = IS_ARRAY(array);
-  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
+  var stepping = DEBUG_IS_STEPPING();
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
@@ -1259,7 +1259,7 @@ function ArrayEvery(f, receiver) {
   }
 
   var is_array = IS_ARRAY(array);
-  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
+  var stepping = DEBUG_IS_STEPPING();
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
@@ -1293,7 +1293,7 @@ function ArrayMap(f, receiver) {
   var result = new $Array();
   var accumulator = new InternalArray(length);
   var is_array = IS_ARRAY(array);
-  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
+  var stepping = DEBUG_IS_STEPPING();
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
@@ -1443,7 +1443,7 @@ function ArrayReduce(callback, current) {
   }
 
   var receiver = %GetDefaultReceiver(callback);
-  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(callback);
+  var stepping = DEBUG_IS_STEPPING();
   for (; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
@@ -1480,7 +1480,7 @@ function ArrayReduceRight(callback, current) {
   }
 
   var receiver = %GetDefaultReceiver(callback);
-  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(callback);
+  var stepping = DEBUG_IS_STEPPING();
   for (; i >= 0; i--) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];