[Crash-utility] GCORE: add directly show backtrace function in crash

[Lei Wen]

Hi Daisuke,

I create a new option "-tT" for gcore, so that it could display bt for user
space
directly inside crash itself, without needing to dump a separated core file
image,
and analyze it in a different gdb env.

The attached patch is directly based on below patch, and verify over ARM
platform.
http://osdir.com/ml/general/2012-10/msg32677.html

Before use the corresponding gcore command, we need set env in crash by:

crash>> gdb set solib-search-path [system lib path]

crash>> gdb file   [user space program symbol file]

crash>> gcore -t [user space thread id]

Thanks,
Lei
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