Process record and replay checked in to main trunk

[Hui Zhu]

>
>> And precord still has a long way to go.  There have a lot of thing need to do:
>
> Thanks for this road map. IMHO this is the kind of thing that could go
> on the wiki. In fact, I just added it under:
>
> http://sourceware.org/gdb/wiki/ReversibleDebugging

Thanks Thiago.

I added 2 items to this wiki.  There are about doc and testsuite.

Thanks,
Hui