[llvm] Add option to print entire function instead of just the loops for loo… (PR #123229)

[Justin Fargnoli via llvm-commits]

================
@@ -999,6 +999,18 @@ void llvm::printLoop(Loop &L, raw_ostream &OS, const std::string &Banner) {
     return;
   }
 
+  if (forcePrintFuncIR()) {
----------------
justinfargnoli wrote:

```suggestion
  if (forcePrintModuleIR() || forcePrintFuncIR()) {
```

I'm unsure as to what semantics we would want here. In your experience, is it helpful to have the module printed out followed by the function? 

https://github.com/llvm/llvm-project/pull/123229