https://github.com/jmorse approved this pull request.

LGTM. This means we'll be leaning on state a little more, with the risk of 
something getting stale, but I guess that's the trade-off for these 
optimisations.

An entirely optional extra bit of validation would be building stage2-clang 
with/without this patch and seeing whether it builds an identical binary -- 
that usually sets my mind at rest that there aren't any other sneek paths that 
are getting stale state. (Not necessary to land IMO).

https://github.com/llvm/llvm-project/pull/193918
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