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This commit adds a new function `ConversionPatternRewriter::replaceOpWithMultiple`. This function is similar to `replaceOp`, but it accepts multiple `ValueRange` replacements, one per op result. Note: This function is not an overload of `replaceOp` because of ambiguous overload resolution that would make the API difficult to use. This commit aligns "block signature conversions" with "op replacements": both support 1:N replacements now. Due to incomplete 1:N support in the dialect conversion driver, an argument materialization is inserted when an SSA value is replaced with multiple values; same as block signature conversions already work around the problem. These argument materializations are going to be removed in a subsequent commit that adds full 1:N support. The purpose of this PR is to add missing features gradually in small increments. This commit also updates two MLIR transformations that have their custom workarounds around missing 1:N support. These can already start using `replaceOpWithMultiple`. Co-authored-by: Markus Böck <markus.boeck02@gmail.com>