Fix type problems in loop ivs.

Fix pr42644.
Fix pr42130 (dealII).

2010-03-03  Tobias Grosser  <grosser@fim.uni-passau.de>

	* gcc/graphite-clast-to-gimple.c (clast_to_gcc_expression): Also
	handle conversions from pointer to integers.
	(gcc_type_for_cloog_iv): Choose the smalles signed integer as an
	induction variable, to be able to work with code generated by
	CLooG.
	* gcc/graphite-sese-to-poly.c (scop_ivs_can_be_represented): New.
	(build_poly_scop): Bail out if we cannot codegen a loop.
	* gcc/testsuite/gcc.dg/graphite/id-18.c: New.
	* gcc/testsuite/gcc.dg/graphite/run-id-pr42644.c: New.
	* libgomp/testsuite/libgomp.graphite/force-parallel-1.c: Adjust.
	* libgomp/testsuite/libgomp.graphite/force-parallel-2.c: Adjust.

From-SVN: r157286