Thread.single_step field, anything using it?

[Alan Bateman]

I've been going through the fields in java.lang.Thread and I'm wondering 
if this field can be removed:

    /* Whether or not to single_step this thread. */
    private boolean     single_step;
This field was used in the original Classic VM (pre-OpenJDK history). It 
doesn't appear to be used in the HotSpot VM.

Does anyone know of any reason to keep it? Are there other VMs using it 
by any chance?

-Alan