Added AnalyzerStatsChecker, a path sensitive check that reports visitation statistics about analysis. Running clang with the -analyzer-stats flag will emit warnings containing the information. We can then run a postanalysis script to take this data and give useful information about how much the analyzer missed in a project.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113568 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Checker/AnalysisConsumer.cpp b/lib/Checker/AnalysisConsumer.cpp
index ad5ccb5..e717ce0 100644
--- a/lib/Checker/AnalysisConsumer.cpp
+++ b/lib/Checker/AnalysisConsumer.cpp
@@ -350,6 +350,10 @@
       || C.Opts.EnableExperimentalInternalChecks)
     RegisterIdempotentOperationChecker(Eng);
 
+  // Enable AnalyzerStatsChecker if it was given as an argument
+  if (C.Opts.AnalyzerStats)
+    RegisterAnalyzerStatsChecker(Eng);
+
   // Set the graph auditor.
   llvm::OwningPtr<ExplodedNode::Auditor> Auditor;
   if (mgr.shouldVisualizeUbigraph()) {