Function hipGraphCreate 

pub unsafe extern "C" fn hipGraphCreate(
    pGraph: *mut hipGraph_t,
    flags: c_uint,
) -> hipError_t

@brief Creates a graph

@param [out] pGraph - pointer to graph to create. @param [in] flags - flags for graph creation, must be 0.

@returns #hipSuccess, #hipErrorInvalidValue, #hipErrorMemoryAllocation