Porting GRAPHITE to CLooG trunk

by Andreas Simbuerger for GCC, the GNU Compiler Collection

This project aims to port GRAPHITE's CLooG interface to the official CLooG. GRAPHITE uses CLooG to perform code generation for loops represented in the polyhedral model. By porting the interface, GRAPHITE is able to use new backends for generating code out of polyhedral program representations, the Integer Set Library (ISL) and a new backend for the Parma Polyhedral Library (PPL).