Merge of r20795 - LLDB arch detection

[Greg Clayton]

Feel free to cherry pick any fixes that improve the overall abilities of the 3.5 and 3.6 branches. 

Greg

> On Mar 6, 2015, at 12:31 PM, Tom Stellard <tom at stellard.net> wrote:
> 
> On Mon, Mar 02, 2015 at 04:31:01PM +0100, Sylvestre Ledru wrote:
>> Hello Tom & others,
>> 
>> I would like to propose the r20795 for merge into both 3.5 & 3.6 LLDB
>> branches.
>> It fixes bug http://llvm.org/bugs/show_bug.cgi?id=20400
>> 
>> FYI, I am applying this patch on top of the Debian packages already but
>> I think
>> it could save a lot of time to users.
>> 
> 
> This looks OK to me, who is the code owner for this?
> 
> -Tom
> 
>> Thanks,
>> Sylvestre  '
>>