[RFA] (riscv/ada) fix error when calling functions with range argument

[Tom Tromey]

>>>>> "Andrew" == Andrew Burgess <andrew.burgess@embecosm.com> writes:

Andrew> So I took a look at doing this switch for RISC-V, and the problem is
Andrew> the handling of vectors.
[...]
Andrew> I wonder if we should change the relationship between 'type_align' and
Andrew> 'gdbarch_type_align'?
[...]
Andrew> Below is a rough, untested patch of this idea, feedback welcome.

I think it is a good idea.  Thanks for looking into this.

I think it would be good to update the type_align documentation in
gdbarch.sh to explain what is expected, and in particular what returning
0 means.

Tom