[MLIR][Conversion] Add convert-xevm-to-llvm pass. (#147375) Although XeVM is an LLVM extension dialect, SPIR-V backend relies on [function calls](https://llvm.org/docs/SPIRVUsage.html#instructions-as-function-calls) instead of defining LLVM intrinsics to represent SPIR-V instructions. convert-xevm-to-llvm pass lowers xevm ops to function declarations and calls using the above naming convention. In the future, most part of the pass should be replaced with llvmBuilder and handled as part of translation to LLVM instead. --------- Co-authored-by: Artem Kroviakov <artem.kroviakov@intel.com>
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