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

[Tarun Prabhu via llvm-commits]

================
@@ -1671,6 +1671,11 @@ void CompilerInvocationBase::GenerateCodeGenArgs(const CodeGenOptions &Opts,
   else
     GenerateArg(Consumer, OPT_fno_loop_interchange);
 
+  if (Opts.FuseLoops)
+    GenerateArg(Consumer, OPT_fexperimental_loop_fuse);
+  else
+    GenerateArg(Consumer, OPT_fno_experimental_loop_fuse);
----------------
tarunprabhu wrote:

NIT
```suggestion
    GenerateArg(Consumer, OPT_fno_experimental_loop_fusion);
```

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