[PATCH][gdb/tdep] Use pid to choose x86_64 process 64/32-bitness

[Tom de Vries]

On 5/21/21 12:50 PM, Alan Hayward wrote:
>> I think it makes sense in any case to probe the main thread, we know
>> it's always ok.
>>
> 
>  ...But agreed this is the sensible option. Even if io_uring is ok, something else
> could get added down the line which isn’t ok. Using pid should keep it safe.
> 

Changes since last post:
- added riscv64 (adding maintainers in cc)
- added suggested change for arm
- added comment at read_description in target.h

Any further comments?

Thanks,
- Tom
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