[llvm] [PassInstrumentation] Make getPassNameForClassName return optional (PR #150029)

[Nikita Popov via llvm-commits]

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@@ -346,7 +346,7 @@ static void runNewPMPasses(const Config &Conf, Module &Mod, TargetMachine *TM,
     raw_string_ostream OS(PipelineStr);
     MPM.printPipeline(OS, [&PIC](StringRef ClassName) {
       auto PassName = PIC.getPassNameForClassName(ClassName);
-      return PassName.empty() ? ClassName : PassName;
+      return PassName ? ClassName : *PassName;
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nikic wrote:

```suggestion
      return !PassName ? ClassName : *PassName;
```
Inverted condition?

https://github.com/llvm/llvm-project/pull/150029