[JIT] simplify logic for merging types during profiling (#69096)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69096
Instead of storing profiling data in a map and then merginging at
the end, perform merging directly during profiling.
Test Plan: Imported from OSS
Reviewed By: ZolotukhinM
Differential Revision: D32772626
Pulled By: davidberard98
fbshipit-source-id: 22622c916a61908b478dd09433815685ce43682a
