kgdb update patch

[Simon 'corecode' Schubert]

hey,

to all debugging kernel cores now and then:

please try out my kgdb changes which i imported from freebsd.  it 
provides a new binary kgdb, thus gdb -k doesn't exist anymore.  it can 
show all kernel threads and is better in unwinding over trap frames.

i need feedback before i can commit this, so please check it out.

get the patch from 
<http://chlamydia.fs.ei.tum.de/~corecode/unsorted/kgdb.diff>

cheers
  simon
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