Ian Wood d97bc388fd Reapply "Extend getBackwardSlice to track values captured… (#114452) ...

This commit fixes the failure in the original PR when building with
shared libs. The problem is that `visitUsedValuesDefinedAbove` is
defined in `MLIRTransformUtils`, but that lib depends on this lib
(`MLIRAnalysis`). To fix, I dropped the use of
`visitUsedValuesDefinedAbove` and use `Region::walk` to traverse values
defined above.

Reapplies PR https://github.com/llvm/llvm-project/pull/113478
Reverts PR https://github.com/llvm/llvm-project/pull/114432

This reverts commit a9a8351.

2024-11-01 08:42:12 -07:00

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