[mlir][LLVM] `ControlFlowToLLVM`: Add 1:N type conversion support (#153937)
Add support for 1:N type conversions to the `ControlFlowToLLVM` lowering
patterns. Not applicable to `cf.switch` and `cf.assert`.
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Co-authored-by: Tobias Gysi <tobias.gysi@nextsilicon.com>