[PATCH] riscv: add support for static PIE

[Florian Weimer]

* Adhemerval Zanella Netto:

>>> It happens with -fstack-protector-all, which although it does not make much
>>> sense to be used it is still supported.
>> 
>> I think it can be part of a separate commit.  Care to provide one?
>> 
>
> Alright, I will send it shortly.

Please put it alongside the generic implementation.  I believe every
architecture using it needs to disable stack protector.

Thanks,
Florian