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

[Tarun Prabhu via llvm-commits]

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@@ -32,6 +32,9 @@ page](https://llvm.org/releases/).
 
 ## New Compiler Flags
 
+* -floop-interchange is now recognized by flang.
+* -fexperimental-loop-fuse is now recognized by flang.
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tarunprabhu wrote:

```suggestion
* -fexperimental-loop-fusion is now recognized by flang.
```

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