This is the last one.  Subject tells everything, however this patch is
*not* for review, but for helping you to understand my design of the
first 3 patches,

0001: refactor displaced stepping to handle 32-bit and 16-bit,
http://sourceware.org/ml/gdb-patches/2011-02/msg00790.html
0002: refactor and create some copy helpers
http://sourceware.org/ml/gdb-patches/2011-02/msg00792.html
0003: for 16-bit Thumb instructions
http://sourceware.org/ml/gdb-patches/2011-02/msg00866.html

There are still some problems in this patch, and I still need some time
to polish it.

-- 
Yao (齐尧)