Diffusion FreeBSD src repository - subversion rS278997

Use the ARM unwinder with dtrace to extract the stack when asked. With this
rS278997
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Description

Use the ARM unwinder with dtrace to extract the stack when asked. With this
dtrace is able to display a stack trace similar to the one below.

dtrace -p 603 -n 'tcp:kernel::receive { stack(); }'

0     70                         :receive
            kernel`ip_input+0x140
            kernel`netisr_dispatch_src+0xb8
            kernel`ether_demux+0x1c4
            kernel`ether_nh_input+0x3a8
            kernel`netisr_dispatch_src+0xb8
            kernel`ether_input+0x60
            kernel`cpsw_intr_rx+0xac
            kernel`intr_event_execute_handlers+0x128
            kernel`ithread_loop+0xb4
            kernel`fork_exit+0x84
            kernel`swi_exit
            kernel`swi_exit

Tested by: gnn
Sponsored by: ABT Systems Ltd