Fixing crash in ViewGroup.dispatchPopulateAccessibilityEvent

1. There was a double call to recycle of a pooled instance
   which was causing an exception. Removed an unnecessary call.

bug:6408689

Change-Id: Ic74b743c6be28ca95ab84b15f28edb5bc95f0a88

Author: sganov

core/java/android/view/ViewGroup.java

@@ -2438,7 +2438,6 @@ boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) {
                 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
                     handled = child.dispatchPopulateAccessibilityEvent(event);
                     if (handled) {
-                        children.recycle();
                         return handled;
                     }
                 }