gdbstub: Fix gdb_register_coprocessor() register counting

gdbstub: Fix gdb_register_coprocessor() register counting

Commit a0e372f0c49ac01faeaeb73a6e8f50e8ac615f34 reorganized the register
counting for GDB. While it seems correct not to let the total number of
registers skyrocket in an SMP scenario through a static variable, the
distinction between total register count and 'g' packet register count
(last_reg vs. num_g_regs) got lost among the way.

Fix this by introducing CPUState::gdb_num_g_regs and using that in
gdb_handle_packet().

Reported-by: Aneesh Kumar K.V <[email protected]>
Cc: [email protected] (stable-1.6)
Tested-by: Aneesh Kumar K.V <[email protected]>
Tested-by: Max Filippov <[email protected]>
Tested-by: Peter Maydell <[email protected]>
Signed-off-by: Andreas Färber <[email protected]>