Release Note: Empty Element in -Xbootclasspath/a

The bootstrap class loader has been changed to skip an empty element specified in `-Xbootclasspath/a` when locating resources. This change might impact existing code that relies on an empty element in the boot class path to find resources in the current working directory. Those applications will now need to use the `-Xbootclasspath/a` option to properly set the directory that the bootstrap class loader searches when locating resources.