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

[Kiran Chandramohan via llvm-commits]

kiranchandramohan wrote:

I have created a post in discourse. https://discourse.llvm.org/t/disable-flang-from-pre-commit-tests-when-flang-files-are-not-touched/79251

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