* rename pten dir to phi

* rename namespace to phi

* rename infrt pten dir to phi

* resolve conflict

* rename pten to phi in cmake

* revert all infrt change

* change needed files

* fix infrt failed

* fix inference failed

* remove offset in storage

* revert api change

* fix custom op slice bug

* fix mutable_data error

* Replaced pten::LoD with paddle::framework::LoD

* Overrided CPUVector with CUDAVector

* Refactored paddle::framework::Vector

* rename TensorBase interface data_type() to dtype()

* rename type to dtype of TensorMeta

* merge the code

* merge the code

* fix the problem when merge conflict