[clang] [flang] [llvm] [openmp] [Flang] Move builtin .mod generation into runtimes (PR #137828)

[Michael Kruse via llvm-commits]

Meinersbur wrote:

@vzakhari Of course. I still haven't figured out the CMAKE_Fortran_PREPROCESS_SOURCE problem yet. Seems to be a transient problem with older versions of cmake.

Created a re-apply PR: #169638. Will not merge until I get an approval from you. So far there hasn't been any activity from NVidia.

https://github.com/llvm/llvm-project/pull/137828