[clang-tools-extra] [clang-tidy] Compact the confusable identifier table (PR #202626)

[Baranov Victor via cfe-commits]

https://github.com/vbvictor commented:

TBH, I haven't looked at this check before.
Could you please describe how we store data before and now.

https://github.com/llvm/llvm-project/pull/202626