isl_basic_map_contains: return false in case of dimension mismatch
isl_basic_map_contains: return false in case of dimension mismatch

The sample value that is being tracked may no longer match the dimension.
In this case, it does not belong to the basic map, so the result should be
"false" rather than an error.

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

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