Michael137 wrote:

> There are a few follow up performance improvements I've tried to get in (i.e. 
> #164608), but there was little interest from the team in those PRs.

The patch improves things slightly (around 14%) on my test-case. But the 
performance regression is still quite sizeable. I realise we have an escape 
hatch with `-debug-info-macro-expansion-loc` 
(https://github.com/llvm/llvm-project/pull/174895), so we might be able to work 
around that for now. But ideally we'd get to the bottom of the regression since 
it's turned on by default. Will see if I can find something

https://github.com/llvm/llvm-project/pull/163982
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