nico wrote:

AI-assisted.

I also tried replacing the std::map with a DenseMap, but that got a bit messy 
because ASTWriter then has to sort before writing. Just the one-element cache 
is a bigger win than just the DenseMap (-0.93% vs -0.77% instructions; doing 
both is -1.03%). Since they compose and this one is smaller, nicer, more 
self-contained, and a bigger win, I figured I'd send out this version.

https://github.com/llvm/llvm-project/pull/228956
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