print original code if we may not be able to print the transformed code
print original code if we may not be able to print the transformed code

pet will be extended to parse more kinds of data dependent accesses,
while pet_stmt_build_ast_exprs may not be able to handle them at first.
Call pet_scop_can_build_ast_exprs to make sure that we will be
able to print the transformed statements.

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

Meinersbur/ppcg,nicolasvasilache/ppcg,nicolasvasilache/ppcg,Meinersbur/ppcg