HeapProfiler: very slow ~4min "take snapshot time" for 80MB gmail heap.

src/heap-snapshot-generator.h

Index: src/heap-snapshot-generator.h
diff --git a/src/heap-snapshot-generator.h b/src/heap-snapshot-generator.h
index ccdcab4a36e820ec14aedab842051f030ec1d397..52cfafd2c186fb0b26ef245066ccaf6c6de2abb1 100644
--- a/src/heap-snapshot-generator.h
+++ b/src/heap-snapshot-generator.h
@@ -100,7 +100,9 @@ class HeapEntry BASE_EMBEDDED {
     kRegExp = v8::HeapGraphNode::kRegExp,
     kHeapNumber = v8::HeapGraphNode::kHeapNumber,
     kNative = v8::HeapGraphNode::kNative,
-    kSynthetic = v8::HeapGraphNode::kSynthetic
+    kSynthetic = v8::HeapGraphNode::kSynthetic,
+    kConsString = v8::HeapGraphNode::kConsString,
+    kSlicedString = v8::HeapGraphNode::kSlicedString
   };
   static const int kNoEntry;