[PyTorch] Add OpCode cache in ByteCodeDeserializer (#64110)

[PyTorch] Add OpCode cache in ByteCodeDeserializer (#64110)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64110

As the code comment says, we can exploit pickler string interning to accelerate OpCode parsing. No more strcmp!
ghstack-source-id: 137978946

Test Plan:
Pixel 3 before: https://www.internalfb.com/intern/aibench/details/591414145082422
Pixel 3 after: https://www.internalfb.com/intern/aibench/details/484557404703261

new mean is 292 ms, down from 302 ms.

Reviewed By: dhruvbird

Differential Revision: D30615052

fbshipit-source-id: 9707625e778388a7920ab72704d71ad57ddaac17