[clang] [clang-tools-extra] [lldb] [llvm] [Support][JSON] Use `std::unordered_map` for object storage (PR #171230)

[Cyndy Ishida via cfe-commits]

https://github.com/cyndyishida commented:

I agree with your conclusion, very interesting results!
Please also update the commit/pr description to mention `Assisted by: <model version>`, [to document AI usage](https://llvm.org/docs/AIToolPolicy.html)

https://github.com/llvm/llvm-project/pull/171230