[Lite Interpreter] Operator registration migrate from manual to selective build (#35426)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35426
Use selective build with the full set of operators (vs. manually register each used op with "_" prefix).
Lite interpreter relies on JIT operator dispatch. In future we still need JIT operator dispatch dispatch ops that are not registered in c10.
Currently the selective build is for c10/aten dispatch in BUCK. There is JIT selective code-gen in OSS but not ported to BUCK yet.
This diff is also porting the selective code-gen in BUCK.
* The selected op list is passed to gen_jit_dispatch.py.
* The list passed to gen_jit_dispatch is the top-level ops (USED_PT_OPS) only, because the selective c10/aten dispatch already registered other ops that are called from the top-level ops.
ghstack-source-id: 101885215
(Note: this ignores all push blocking failures!)
Test Plan:
1. In Python, run torch.jit.export_opnames(scripted_M_mod)
2. Append the operator names into fbcode/caffe2/pt_ops.bzl and the BUCK target.
3. Run
```
buck run xplat/caffe2/fb/lite_predictor:lite_predictor_bi -- --model=/home/myuan/temp/bi_pytext_0315.bc --input_dims "1,4" --input_type int64 --pytext_len=4
```
Should provide expected results.
In addition, the size of the generated code for JIT registration, for example, ```register_aten_ops_0.cpp```, should be significantly reduced (from ~250 KB to ~80KB). The non-selected op registration schema are still kept, but the registration functor is replaced by ```DUMMY_OPERATION```
Reviewed By: ljk53
Differential Revision: D20408831
fbshipit-source-id: ec75dd762c4613aeda3b2094f5dad11804dc9492
