add vulcan support to gas

[Nick Clifton]

Hi Virendra,

> gas/ChangeLog:
> Virendra Pathak <virendra.pathak@broadcom.com>
> 
>         * config/tc-aarch64.c (aarch64_cpus): Add vulcan.
>         * doc/c-aarch64.texi: Document that vulcan is a valid processor name.

Approved and applied.  Thanks for contributing this patch.


>From your original posting:

> Keeping this in mind, do we still need to add -mcpu=vulcan support to
> gas, given that many armv8-a vendors have done it?

Yes.  Assembly level programmers may wish to generate their own gas command 
lines.  Plus it is entirely possible that one day gcc might pass the -mcpu
option on to gas.

Cheers
   Nick