[mlir][Transforms][NFC] Simplify `ArgConverter` state (#81462) * When converting a block signature, `ArgConverter` creates a new block with the new signature and moves all operation from the old block to the new block. The new block is temporarily inserted into a region that is stored in `regionMapping`. The old block is not yet deleted, so that the conversion can be rolled back. `regionMapping` is not needed. Instead of moving the old block to a temporary region, it can just be unlinked. Block erasures are handles in the same way in the dialect conversion. * `regionToConverter` is a mapping from regions to type converter. That field is never accessed within `ArgConverter`. It should be stored in `ConversionPatternRewriterImpl` instead. * `convertedBlocks` is not needed. Old blocks are already stored in `ConvertedBlockInfo`.
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