modify infer to get abstract value and attr value map together

support get attr in specialize

clone primitive when specialize if attribute is not the same with
infered attribute

Merge pull request !1320 from JichenZhao/applyrms_squaresumall_cumprod_reduceprod

Merge pull request !1279 from gongchen/fix_custom_op_case

Merge pull request !1058 from sunsuodong/lstm_ops

Merge pull request !1091 from chenweifeng/cast

Merge pull request !1057 from chenweifeng/matmul

Merge pull request !370 from chenweifeng/unsorted_segment_sum

Merge pull request !994 from chenweifeng/broadcast_unequal_dims

Merge pull request !1021 from chenweifeng/broadcast_grad

Merge pull request !948 from chenweifeng/logsoftmax

Merge pull request !322 from chenweifeng/rmsprop

Merge pull request !323 from chenweifeng/concat

Merge pull request !324 from chenweifeng/slice

Merge pull request !372 from chenweifeng/batchmatmul

Merge pull request !502 from chenweifeng/gelu

Merge pull request !516 from chenweifeng/tanh

Merge pull request !945 from chenweifeng/unary

Merge pull request !849 from vlne-v1/I1FQ76-wrong-format-of-boardcast-output-when-multi-output

Merge pull request !756 from chenweifeng/layer_norm