Tom> The first attachment is the log from git master.
Tom> Here's what I did:

Tom> (gdb) tar rem :7960
Tom> Remote debugging using :7960
Tom> 0x0000000000001000 in ?? ()
Tom> (gdb) print $dscratch
Tom> Could not fetch register "dscratch"; remote failure reply 'E14'
Tom> (gdb) print $dscratch0
Tom> $1 = void
Tom> (gdb) print $mucounteren
Tom> Could not fetch register "mucounteren"; remote failure reply 'E14'

I didn't apply your patch before that run.

Here's with your patch:

(gdb) tar rem :7960
Remote debugging using :7960
0x0000000000001000 in ?? ()
(gdb) print $dscratch
$1 = void
(gdb) print $dscratch0
Could not fetch register "dscratch0"; remote failure reply 'E14'
(gdb) print $mucounteren
Could not fetch register "mucounteren"; remote failure reply 'E14'

Tom