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

[Tarun Prabhu via llvm-commits]

tarunprabhu wrote:

> > > What do you think is the right place in pass pipeline?
> > I don't know, but just a gut feeling, somewhere in `buildModuleOptimizationPipeline` looks reasonable to me rather than `buildFunctionSimplificationPipeline`. 
> Yeah, I don't have enough data to support the right place in the pipeline.

In that case. it may be better to move it to `buildModuleOptimizationPipeline`. This is undoubtedly an optimization, and a non-trivial one at that. There are still open questions about the exact placement of the pass within the optimization pipeline, but moving it into that function, with a (perhaps slightly tweaked) `FIXME` comment is probably better than leaving it in `buildFunctionSimplificationPipeline`.



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