#128358: Change GDB_BUFSZ to be large enough to hold a register dump where each
register takes 16 characters (64-bit register in hex). In practice this
is a slight bit of overkill as 7 of the 56 registers are only 32-bit, but
having the buffer too small results in remote kgdb trashing kernel memory
when it connects.
PR: amd[[ https://bugs.freebsd.org/64 | 64 ]]/108673
Submitted by: Ravi Murty, Nikhil Rao @ Intel
MFC after: 3 days