[mlir][Transforms] Dialect conversion: Unify materialization of value replacements (#108381) PR #106760 aligned the handling of dropped block arguments and dropped op results. The two helper functions that insert source materializations for uses of replaced block arguments / op results that survived the conversion are now almost identical (`legalizeConvertedArgumentTypes` and `legalizeConvertedOpResultTypes`). This PR merges the two functions and moves the implementation directly into `finalize`. This PR simplifies the code base and improves the efficiency a bit: previously, `finalize` iterated over `ConversionPatternRewriterImpl::rewrites` twice. Now, only one iteration is needed. --------- Co-authored-by: Jakub Kuderski <jakub@nod-labs.com>
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