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

[Madhur Amilkanthwar via llvm-commits]

madhur13490 wrote:

> > 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`.
> 
> +1 on this.

Done. I have placed in the suggested function, just after LoopInterchange (with FIXME)

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