[patch] Don't use alias from derived dtor to base dtor at -O0

[Eric Christopher]

After discussion in IRC we've decided to go with this for now to make
debugging a little nicer at O0 while filing a bug to see if we can get
the optimizers to do this for us in a way that gives us full stack
information.

-eric

On Tue, Nov 12, 2013 at 10:17 AM, Rafael Espíndola
<rafael.espindola at gmail.com> wrote:
> The attached patch disables aliasing (and rauw) of derived dtors to
> base dtors at -O0. This optimization can have a negative impact on the
> debug quality.
>
> This was a latent bug for some time with local classes, but got
> noticed when it was generalized and broke gdb's destrprint.exp.
>
> Cheers,
> Rafael
>
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