Add a single-element global positive and negative cache to...

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 4568)
+++ src/heap.cc	(working copy)
@@ -651,6 +651,8 @@
   Top::MarkCompactPrologue(is_compacting);
   ThreadManager::MarkCompactPrologue(is_compacting);
 
+  CompletelyClearInstanceofCache();
+
   if (is_compacting) FlushNumberStringCache();
 }
 
@@ -1662,6 +1664,10 @@
   if (obj->IsFailure()) return false;
   set_non_monomorphic_cache(NumberDictionary::cast(obj));
 
+  set_instanceof_cache_function(Smi::FromInt(0));
+  set_instanceof_cache_map(Smi::FromInt(0));
+  set_instanceof_cache_answer(Smi::FromInt(0));
+
   CreateFixedStubs();
 
   if (InitializeNumberStringCache()->IsFailure()) return false;