Fix -print-after-all banner

[yaron.keren]

Summary

Address https://bugs.llvm.org/show_bug.cgi?id=32207, banner does not print more than once following r292442 by making BannerPrinted local and skipping banner for function declarations.

[mehdi_amini]

LGTM.

[yaron.keren]

Added test in r305213.

llvm/trunk/lib/Analysis/CallGraphSCCPass.cpp

public:
     PrintCallGraphPass(const std::string &B, raw_ostream &o)
       : CallGraphSCCPass(ID), Banner(B), Out(o) {}
 
     void getAnalysisUsage(AnalysisUsage &AU) const override {
       AU.setPreservesAll();
     }
 
     bool runOnSCC(CallGraphSCC &SCC) override {
+      bool BannerPrinted = false;
       auto PrintBannerOnce = [&] () {
-        static bool BannerPrinted = false;
         if (BannerPrinted)
           return;
         Out << Banner;
         BannerPrinted = true;
         };
       for (CallGraphNode *CGN : SCC) {
-        if (CGN->getFunction()) {
-          if (isFunctionInPrintList(CGN->getFunction()->getName())) {
+        if (Function *F = CGN->getFunction()) {
+          if (!F->isDeclaration() && isFunctionInPrintList(F->getName())) {
             PrintBannerOnce();
-            CGN->getFunction()->print(Out);
+            F->print(Out);
           }
         } else if (llvm::isFunctionInPrintList("*")) {
           PrintBannerOnce();
           Out << "\nPrinting <null> Function\n";
         }
       }
       return false;
     }