message: [XLA] Propagate BF16 through kGather.
diff: @@ -105,6 +105,8 @@ bool BFloat16Support::EffectiveOperandPrecisionIsOutputPrecision(
  return operand_index == 0;
  case HloOpcode::kDynamicUpdateSlice:
  return operand_index == 0 || operand_index == 1;
  + case HloOpcode::kGather:
  + return operand_index == 0;
  case HloOpcode::kSelect:
  case HloOpcode::kTupleSelect:
  return operand_index == 1 || operand_index == 2;
  