[D-runtime] Use of X86 and X86_64 in druntime and phobos

[Walter Bright]

On 11/25/2011 9:26 PM, Alex wrote:
> IOW, use D_LP64 instead of X86 and
> X86_64.
>
> If we can agree on this, I'll gladly submit some patches to both
> projects to sort this out.
>

Sounds good to me.