Add new optional getPassName() virtual function that a Pass can override

to make debugging output a lot nicer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2395 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/InstructionCombining.cpp

@@ -42,6 +42,8 @@ namespace {
     }
 
   public:
+    const char *getPassName() const { return "Instruction Combining"; }
+
     virtual bool runOnFunction(Function *F);
 
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {