[clang] [flang] [llvm] Introduce -fexperimental-loop-fuse to clang and flang (PR #142686)

[Ryotaro Kasuga via llvm-commits]

kasuga-fj wrote:

Just in case: it's not "just after LoopInterchange", it's "before LoopDeletion". If you want to run it just after LoopInterchange, please add LoopFuse after adding `LPM` to `OptimizePM`. It might be better adding some test to check the position.

Also, you may want to avoid rebasing and force pushing when possible (see [Updating Pull Requests](https://llvm.org/docs/GitHub.html#updating-pull-requests)).

https://github.com/llvm/llvm-project/pull/142686