* fix mask rcnn bug:
1. affine channel fuse (diff)
2. condition block op (memory leak)
3. merge lod tensor op (diff)
4. memroy optim (diff)
test=develop

* fix ci aboud PADDLE_ENFOCE
fix merge lod infer op ut
test=develop

* fix: when use the load model from memory mode, the RAM occupy is high

test=develop

* ligth mem reuse
test=develop

* fix cpplint
test=develop