[NFC][Debugify] Format the CheckModuleDebugify output

[djtodoro]

Summary

This fixes the output of the check-debugify option.
Without the patch an example of running the option:

$ opt -check-debugify test.ll -S -o testDebugify.ll
CheckModuleDebugifySkipping module without debugify metadata

After the patch:

$ opt -check-debugify test.ll -S -o testDebugify.ll
CheckModuleDebugify: Skipping module without debugify metadata

[djtodoro]

• posting the right patch

llvm/lib/Transforms/Utils/Debugify.cpp

struct DebugifyFunctionPass : public FunctionPass {
   static char ID; // Pass identification.
 };
 
 /// ModulePass for checking debug info inserted by -debugify, used with the
 /// legacy module pass manager.
 struct CheckDebugifyModulePass : public ModulePass {
   bool runOnModule(Module &M) override {
     return checkDebugifyMetadata(M, M.functions(), NameOfWrappedPass,
-                                 "CheckModuleDebugify", Strip, StatsMap);
+                                 "CheckModuleDebugify: ", Strip, StatsMap);
   }
 
   CheckDebugifyModulePass(bool Strip = false, StringRef NameOfWrappedPass = "",
                           DebugifyStatsMap *StatsMap = nullptr)
       : ModulePass(ID), Strip(Strip), NameOfWrappedPass(NameOfWrappedPass),
         StatsMap(StatsMap) {}
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {