[mlir] Fix build failure with BUILD_SHARED_LIBS=ON
/usr/bin/ld: tools/mlir/lib/Dialect/GPU/Pipelines/CMakeFiles/obj.MLIRGP
UPipelines.dir/GPUToXeVMPipeline.cpp.o: in function `mlir::gpu::buildLo
werToXeVMPassPipeline(mlir::OpPassManager&, mlir::gpu::GPUToXeVMPipelin
eOptions const&)':
GPUToXeVMPipeline.cpp:(.text._ZN4mlir3gpu28buildLowerToXeVMPassPipeline
ERNS_13OpPassManagerERKNS0_24GPUToXeVMPipelineOptionsE+0x1293): undefin
ed reference to `mlir::createConvertVectorToLLVMPass()'
