[mlir][Transforms][NFC] Dialect conversion: Eagerly build reverse mapping (#101476)

The "inverse mapping" is an inverse IRMapping that points from replaced
values to their original values. This inverse mapping is needed when
legalizing unresolved materializations, to figure out if a value has any
uses. (It is not sufficient to examine the IR, because some IR changes
have not been materialized yet.)

There was a check in `OperationConverter::finalize` that computed the
inverse mapping only when needed. This check is not needed.
`legalizeUnresolvedMaterializations` always computes the inverse
mapping, so we can just do that in `OperationConverter::finalize` before
calling `legalizeUnresolvedMaterializations`.

Depends on #98805

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