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

src/harmony-typedarray.js

Index: src/harmony-typedarray.js
diff --git a/src/harmony-typedarray.js b/src/harmony-typedarray.js
index c2eb452af378ca1b2b240653a2de04e06777df16..1759172ab674b931eafd5bcc87563295f5c154af 100644
--- a/src/harmony-typedarray.js
+++ b/src/harmony-typedarray.js
@@ -49,7 +49,7 @@ function NAMEForEach(f /* thisArg */) {  // length == 1
     needs_wrapper = SHOULD_CREATE_WRAPPER(f, receiver);
   }
 
-  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
+  var stepping = DEBUG_IS_STEPPING();
   for (var i = 0; i < length; i++) {
     var element = this[i];
     // Prepare break slots for debugger step in.