Function compile_gpu_d4_and_verify 

pub fn compile_gpu_d4_and_verify(
    cnf: &GpuCnf,
    decision_var_limit: &TrackedCudaSlice<u32>,
    provider: &Arc<CudaKernelProvider>,
    config: &GpuCompileConfig,
) -> Result<GpuXgcf>

Compile CNF on GPU, then verify equivalence with GPU CDCL.