Improve the -filter-print-funcs option to skip the banner for CGSCC…

… pass when nothing is to be printed

Before, it would print a sequence of:

  *** IR Dump After Function Integration/Inlining ******
  *** IR Dump After Function Integration/Inlining ******
  *** IR Dump After Function Integration/Inlining ******
  ...

for every single function in the module.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292442 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/CallGraphSCCPass.cpp

@@ -609,13 +609,23 @@ namespace {
     }
 
     bool runOnSCC(CallGraphSCC &SCC) override {
-      Out << Banner;
+      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 (isFunctionInPrintList(CGN->getFunction()->getName())) {
+            PrintBannerOnce();
             CGN->getFunction()->print(Out);
-        } else
+          }
+        } else if (llvm::isFunctionInPrintList("*")) {
+          PrintBannerOnce();
           Out << "\nPrinting <null> Function\n";
+        }
       }
       return false;
     }