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The current scheme used by reinstantiating conversion patterns in `lib/Conversion/Utils/Dialects` for operations with blocks is to create a new operation with empty blocks, to move the operations from the old blocks and then to replace any references to block arguments. However, such in-place updates of the types of block arguments leave conversion patterns for operations nested in the blocks without the ability to determine the original types of values from before the update. This change uses proper signature conversion for block arguments, such that the original types of block arguments with converted types is preserved, while the new types are made available through the dialect conversion infrastructure via the respective adaptors.