[llvm] [CI] Disable flang from pre-commit tests when Flang files are not touched (PR #93485)

[Valentin Clement バレンタイン クレメン via llvm-commits]

clementval wrote:

> > > Yes but only on PR that don't touch flang directly. That is a PR that would only touch other projects (llvm/mlir/clang) used to to trigger testing of Flang since they can potentially break it.
> > 
> > 
> > It would be nice to keep flang testing on linux at least when MLIR is changed since it relies a lot on it.
> 
> Isn't is tested in post-commit bots?

Yes, I just don't see the problem to have it in linux pre-commit since it was reliable so far until now. If it's a problem of build time or load then it's a different issue. 

https://github.com/llvm/llvm-project/pull/93485