[PyTorch Edge] Leave out field for debug_handle if not being built with eager symbolication support (#66131)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66131
Turns out that a model with 72k instructions causes about 0.5MiB of additional memory overhead (if there's an 8 byte memory overhead per instruction). This is not necessary if we're building w/o eager symbolication support. This change eliminates the 8 byte `debug_handle` if the build is w/o eager symbolication support.
ghstack-source-id: 140045478
(Note: this ignores all push blocking failures!)
Test Plan:
```
buck build -c "pt.enable_eager_symbolication"=1 //xplat/caffe2/fb/lite_predictor:lite_predictor
buck build //xplat/caffe2/fb/lite_predictor:lite_predictor
```
Reviewed By: kimishpatel
Differential Revision: D31387784
fbshipit-source-id: af56787ad833b990a46b79ab021e512edaa22143
