[analyzer] Rename addTrackNullOrUndefValueVisitor to trackNullOrUndefValue.

This helper function (in the clang::ento::bugreporter namespace) may add more
than one visitor, but conceptually it's tracking a single use of a null or
undefined value and should do so as best it can.

Also, the BugReport parameter has been made a reference to underscore that
it is non-optional.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162720 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp b/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
index 5edcf09..eef29cb 100644
--- a/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
@@ -75,7 +75,7 @@
   BugReport *R = new BugReport(*BT, BT->getName(), N);
   if (BadE) {
     R->addRange(BadE->getSourceRange());
-    bugreporter::addTrackNullOrUndefValueVisitor(N, BadE, R);
+    bugreporter::trackNullOrUndefValue(N, BadE, *R);
   }
   C.EmitReport(R);
 }
@@ -122,7 +122,7 @@
       BugReport *R = new BugReport(*BT, Desc, N);
       R->addRange(argRange);
       if (argEx)
-        bugreporter::addTrackNullOrUndefValueVisitor(N, argEx, R);
+        bugreporter::trackNullOrUndefValue(N, argEx, *R);
       C.EmitReport(R);
     }
     return true;
@@ -335,7 +335,7 @@
 
       // FIXME: getTrackNullOrUndefValueVisitor can't handle "super" yet.
       if (const Expr *ReceiverE = ME->getInstanceReceiver())
-        bugreporter::addTrackNullOrUndefValueVisitor(N, ReceiverE, R);
+        bugreporter::trackNullOrUndefValue(N, ReceiverE, *R);
       C.EmitReport(R);
     }
     return;
@@ -377,7 +377,7 @@
   report->addRange(ME->getReceiverRange());
   // FIXME: This won't track "self" in messages to super.
   if (const Expr *receiver = ME->getInstanceReceiver()) {
-    bugreporter::addTrackNullOrUndefValueVisitor(N, receiver, report);
+    bugreporter::trackNullOrUndefValue(N, receiver, *report);
   }
   C.EmitReport(report);
 }