[mlir] fix affine-loop-fusion crash (#76351)
If `user` not lies in `Region` `findAncestorOpInRegion` will return `nullptr`. Fixes https://github.com/llvm/llvm-project/issues/76281.
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If `user` not lies in `Region` `findAncestorOpInRegion` will return `nullptr`. Fixes https://github.com/llvm/llvm-project/issues/76281.