message: Add constrain to TFL_BatchMatMulOp.
diff: @@ -1040,7 +1040,12 @@ def TFL_FullyConnectedOp : TFL_Op<"fully_connected", [
  def TFL_BatchMatMulOp : TFL_Op<"batch_matmul", [
  NoSideEffect,
  TFL_OperandHasAtleastRank<0, 2>,
  - TFL_OperandHasAtleastRank<1, 2>]> {
  + TFL_OperandHasAtleastRank<1, 2>,
  + PredOpTrait<"x and output must have same element type or they are int8 and int32",
  + Or<[TFL_TCresVTEtIsSameAsOp<0, 0>,
  + And<[CPred<"getElementTypeOrSelf($_op.getOperand(0)).isInteger(8)">,
  + CPred<"getElementTypeOrSelf($_op.getOperand(1)).isInteger(8)">,
  + CPred<"getElementTypeOrSelf($_op.getResult(0)).isInteger(32)">]>]>>]> {
  let summary = "Batch Matrix Multiply Operator";
  