Move reg_equiv* arrays into a single VEC structure

[H.J. Lu]

On Wed, Mar 30, 2011 at 7:23 AM, Jeff Law <law@redhat.com> wrote:
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> As originally discussed here:
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> http://gcc.gnu.org/ml/gcc-patches/2010-05/msg00987.html
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> Changes since the original submission:
>
> Per Richi's suggestion I changed the patch to use a GC'd VEC.  I defined
> accessor macros so that a ton of reformatting isn't needed and finally I
> made the appropriate tweaks to the few backends that peeked at the
> reg_equiv arrays.
>
> Given the changes and the length of time since the original submission,
> I think it's probably best to get a fresh approval rather than rely on
> the prior approval.
>
> Bootstrapped and regression tested on x86_64-unknown-linux-gnu.
>

It breaks GCC bootstrap on Linux/x86:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48371

-- 
H.J.