message: [XLA:CPU/GPU] Fix a problem in the random number generator.
  Add primitive type S64 to GetNumberOfElementsPerPhiloxRngSample so that the
  random number generator can generate random numbers for signed 64-bit integer.
diff: @@ -1302,6 +1302,7 @@ int32 GetNumberOfElementsPerPhiloxRngSample(PrimitiveType elem_prim_ty) {
  case F16:
  return 4;
  case U64:
  + case S64:
  case F64:
  return 2;
  default:
  