Compile error on x86_64

[Kris Wong]

> I keep running into this compile error:

> /usr/kde/svn/include/kdevplatform/language/duchain/typesystem.h:457:
> error: cast from 'const KDevelop::AbstractType*' to 'uint' loses
> precision

I thought these were fixed?  Can we define some sort of generic pointer
hash function or POINTER_CAST macro that handles this appropriately to use
in the future.  This seems to be a recurring issue.

Kris Wong