[flang-commits] [flang] [flang] Use precompiled parsing headers (PR #130600)

[Kajetan Puchalski via flang-commits]

mrkajetanp wrote:

> For me, the worst offender is `lib/Lower`, with `lib/Semantics` going next

I've got a patch giving those the precompiled header treatment too ready to go once this gets merged and nothing goes wrong with the build bots :) 

https://github.com/llvm/llvm-project/pull/130600