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

[Tarun Prabhu via llvm-commits]

================
@@ -897,6 +897,7 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
   PipelineTuningOptions PTO;
   PTO.LoopUnrolling = CodeGenOpts.UnrollLoops;
   PTO.LoopInterchange = CodeGenOpts.InterchangeLoops;
+  PTO.LoopFuse = CodeGenOpts.FuseLoops;
----------------
tarunprabhu wrote:

NIT
```suggestion
  PTO.LoopFusion = CodeGenOpts.FuseLoops;
```

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