[mlir][Transforms] Support 1:N mappings in `ConversionValueMapping` (#116524) This commit updates the internal `ConversionValueMapping` data structure in the dialect conversion driver to support 1:N replacements. This is the last major commit for adding 1:N support to the dialect conversion driver. Since #116470, the infrastructure already supports 1:N replacements. But the `ConversionValueMapping` still stored 1:1 value mappings. To that end, the driver inserted temporary argument materializations (converting N SSA values into 1 value). This is no longer the case. Argument materializations are now entirely gone. (They will be deleted from the type converter after some time, when we delete the old 1:N dialect conversion driver.) Note for LLVM integration: Replace all occurrences of `addArgumentMaterialization` (except for 1:N dialect conversion passes) with `addSourceMaterialization`. --------- Co-authored-by: Markus Böck <markus.boeck02@gmail.com>
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