introduce a new CallGraphSCC class, and pass it around
to CallGraphSCCPass's instead of passing around a
std::vector<CallGraphNode*>.  No functionality change,
but now we have a much tidier interface.

llvm-svn: 101558
diff --git a/llvm/unittests/VMCore/PassManagerTest.cpp b/llvm/unittests/VMCore/PassManagerTest.cpp
index bc21298..4b38910 100644
--- a/llvm/unittests/VMCore/PassManagerTest.cpp
+++ b/llvm/unittests/VMCore/PassManagerTest.cpp
@@ -154,7 +154,7 @@
 
     struct CGPass : public PassTest<CallGraph, CallGraphSCCPass> {
     public:
-      virtual bool runOnSCC(std::vector<CallGraphNode*> &SCMM) {
+      virtual bool runOnSCC(CallGraphSCC &SCMM) {
         EXPECT_TRUE(getAnalysisIfAvailable<TargetData>());
         run();
         return false;