[COMMITTED] aarch64 dwarf2 fixes

[Bin.Cheng]

Hi Richard,
This causes ld test cases failed on aarch64, as reported in
https://sourceware.org/bugzilla/show_bug.cgi?id=17312

Thanks,
bin

On Sat, Aug 23, 2014 at 5:41 AM, Richard Henderson <rth@redhat.com> wrote:
> I've now committed the three patches that I posted 2 weeks ago re aarch64
> dwarf2 encoding problems.
>
> Without feedback from ARM, I didn't disable the acceptance of the [bhs]N names
> for the vector registers in the context of .cfi_register et al.  I merely
> accept all of the vector register names and give them the proper column number.
>
> The actual commit is in three parts, squashed here because I was lazy in
> generating the email.
>
>
> r~