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

[Madhur Amilkanthwar via llvm-commits]

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@@ -34,6 +34,7 @@ page](https://llvm.org/releases/).
 
 * -floop-interchange is now recognized by flang.
 * -floop-interchange is enabled by default at -O2 and above.
+* -fexperimental-fuse-loops is now recognized by flang.
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madhur13490 wrote:

We should make a similar entry in `clang/docs/ReleaseNotes.md`.

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