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

[Tom Tromey]

>>>>> "Joel" == Joel Brobecker <brobecker@adacore.com> writes:

Joel> gdb/ChangeLog:
Joel>         * gdb/riscv-rdep.c (riscv_type_alignment): Handle TYPE_CODE_RANGE.
Joel> Tested on riscv64-elf using AdaCore's testsuite.
Joel> OK to apply?

I don't have any issue with this, but I do wonder if
riscv_type_alignment can be removed and/or simplified in favor
type_align and the gdbarch method.

I see several ports have this issue.  type_align should be preferred,
IMO, because it respects any additional alignment specified in the
DWARF.  I assume there are latent bugs in function calling on various
platforms caused by this, though I haven't checked.

Tom