https://github.com/ChuanqiXu9 commented:

>  It turns out to be kind of a pain to use with HeaderFileInfoTrait. More 
> importantly, we can't really afford to key by the internal key type since 
> that only hashes on the size of the file and the hash collision gets pretty 
> bad. Moreover, the merging and condensing strategy seems rather simple.

Maybe we can use hash value of the input as the key?

https://github.com/llvm/llvm-project/pull/140867
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