llvm-project

486f83fa - [mlir][Transforms][NFC] Simplify `buildUnresolvedMaterialization` implementation (#121651)

[mlir][Transforms][NFC] Simplify `buildUnresolvedMaterialization` implementation (#121651) The `buildUnresolvedMaterialization` implementation used to check if a materialization is necessary. A materialization is not necessary if the desired types already match the input. However, this situation can never happen: we look for mapped values with the desired type at the call sites before requesting a new unresolved materialization. The previous implementation seemed incorrect because `buildUnresolvedMaterialization` created a mapping that is never rolled back. (When in reality that code was never executed, so it is technically not incorrect.) Also fix a comment that in `findOrBuildReplacementValue` that was incorrect.