Remove obsolete debug code and add new one.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index bdd4785e3e729368ab1c6bf297e48457f9b5c6b4..b47e8d1eb7695fa3214bb026b793ecc71df58856 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -1009,16 +1009,6 @@ void CodeFlusher::ProcessSharedFunctionInfoCandidates() {
 }
 
 
-bool CodeFlusher::ContainsCandidate(SharedFunctionInfo* shared_info) {
-  SharedFunctionInfo* candidate = shared_function_info_candidates_head_;
-  while (candidate != NULL) {
-    if (candidate == shared_info) return true;
-    candidate = GetNextCandidate(candidate);
-  }
-  return false;
-}
-
-
 void CodeFlusher::EvictCandidate(SharedFunctionInfo* shared_info) {
   // Make sure previous flushing decisions are revisited.
   isolate_->heap()->incremental_marking()->RecordWrites(shared_info);