[mlir][LLVM] Fix conversion of non-standard MLIR float types (#122634) Certain non-standard float types were directly passed through in the LLVM type converter, resulting in invalid IR or failed assertions: ``` mlir-opt: mlir/lib/Conversion/LLVMCommon/TypeConverter.cpp:638: FailureOr<Type> mlir::LLVMTypeConverter::convertVectorType(VectorType) const: Assertion `LLVM::isCompatibleVectorType(vectorType) && "expected vector type compatible with the LLVM dialect"' failed. ``` The LLVM type converter should not define invalid type conversion rules for such types. If there is no type conversion rule, conversion patterns will not apply to ops with such operand types.
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