[flang-commits] [flang] [flang] Use precompiled headers in Lower, Parser and Semantics (PR #131137)

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jeanPerier wrote:

What is the impact on the size of the build directories? (I am asking because this[ blog post](https://www.qt.io/blog/2019/08/01/precompiled-headers-and-unity-jumbo-builds-in-upcoming-cmake) is pointing out that the build directory size can increase).

https://github.com/llvm/llvm-project/pull/131137