Add IR name to -print-pass-numbers output

Print the name of the module/function/loop the pass
ran on.

Author: arpilipe

llvm/lib/Passes/StandardInstrumentations.cpp

@@ -812,7 +812,8 @@ void PrintIRInstrumentation::printBeforePass(StringRef PassID, Any IR) {
   ++CurrentPassNumber;
 
   if (shouldPrintPassNumbers())
-    dbgs() << " Running pass " << CurrentPassNumber << " " << PassID << "\n";   
+    dbgs() << " Running pass " << CurrentPassNumber << " " << PassID
+           << " on " << getIRName(IR) << "\n";
 
   if (!shouldPrintBeforePass(PassID))
     return;

llvm/test/Other/print-at-pass-number.ll

@@ -24,8 +24,8 @@ bb4:                                              ; preds = %bb1
   ret i32 %add3
 }
 
-; NUMBER: Running pass 1 LoopSimplifyPass
-; NUMBER-NEXT: Running pass 2 LCSSAPass
-; NUMBER-NEXT: Running pass 3 IndVarSimplifyPass
-; NUMBER-NEXT: Running pass 4 LoopDeletionPass
+; NUMBER:  Running pass 1 LoopSimplifyPass on bar
+; NUMBER-NEXT: Running pass 2 LCSSAPass on bar
+; NUMBER-NEXT: Running pass 3 IndVarSimplifyPass on bb1
+; NUMBER-NEXT: Running pass 4 LoopDeletionPass on bb1
 ; NUMBER-NOT: Running pass