onnxruntime

Support DistilBert's Attention fusion in Optimizer (#4748)

* checkin

* attention fusion

* attention work under layernorm, still need refine

* embedlayernorm(have problems with graph.Resolve())

* some fix

* update: attention works but onnx results in protobuf parsing failed

* tested by optimizer

* add embedlayer fusion test

* add attention fusion test

* clean code, need refactor later

* clean code

* added reshape fusion for distilbert, modified attention, added tests

* refactor

* small fix

* remove uncessary lines

* fix reshape and modify attention

* resolving conflicts

* restore

* refactor and review partial comments

* refactor attention

* small fix

* fix inf compare

* match new pattern for attention fusion

* formatting

* attention does not depend on transposescalematmul

* fix

* review coments

* revert changes

* review comments

* small fix