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

[Tarun Prabhu via llvm-commits]

================
@@ -322,6 +322,7 @@ CODEGENOPT(TimeTrace         , 1, 0, Benign) ///< Set when -ftime-trace is enabl
 VALUE_CODEGENOPT(TimeTraceGranularity, 32, 500, Benign) ///< Minimum time granularity (in microseconds),
                                                         ///< traced by time profiler
 CODEGENOPT(InterchangeLoops  , 1, 0, Benign) ///< Run loop-interchange.
+CODEGENOPT(FuseLoops         , 1, 0, Benign) ///< Run loop-fuse.
----------------
tarunprabhu wrote:

```suggestion
CODEGENOPT(FuseLoops         , 1, 0, Benign) ///< Run loop-fusion.
```

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