[clang] [flang] [llvm] add -floop-fuse to clang and flang (PR #142686)

[Madhur Amilkanthwar via llvm-commits]

madhur13490 wrote:

@tarunprabhu Sure, I can take that suggestion. I have done the changes.

@kasuga-fj I fixed the rebase issue in `flang/docs`.

> I don't think this implies that the pass should be part of the function simplification pipeline. Its position should be determined by what the pass actually does. The appropriate placement likely depends on what you're trying to achieve with it.

What do you think is the right place in pass pipeline? 

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