[analyzer] 'Looping back to the head of the loop' diagnostics are prunable.

llvm-svn: 152083

clang/lib/StaticAnalyzer/Core/BugReporter.cpp

@@ -1279,6 +1279,7 @@ static void GenerateExtensivePathDiagnostic(PathDiagnostic& PD,
           PathDiagnosticEventPiece *p =
             new PathDiagnosticEventPiece(L,
                                         "Looping back to the head of the loop");
+          p->setPrunable(true);
 
           EB.addEdge(p->getLocation(), true);
           PD.getActivePath().push_front(p);