[PATCH] D17241: [Refactor] Move isl_ctx into Scop.

[Johannes Doerfert via llvm-commits]

> And if  ScopInfo, DependencyInfo, IslAst are not free in order, it become a total mess ....
The pass manager should free IslAst, DependencyInfo, ... __before__ ScopInfo
because they have a dependence on the ScopInfo results. Am I wrong?
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