generate loops for all dimensions if -otl 0 is specified
Before, -otl 0 would only generate loops for dimensions that
ended up having identical lower and upper bounds.
However, backends (especially isl, but in some cases also PolyLib)
would usually replace such pairs of lower and upper bounds by
an equality and then no loop would be generated.
Users seem to expect to get a loop even in these cases, so
with this patch, CLooG will now generate a loop for all dimensions
when -otl 0 is specified.
Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>
Tested-by: Michael Claßen <classenm@infosun.fim.uni-passau.de>