Revert r5147 due to failing assert, with no simple solution. Issue 808.

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 5166)
+++ src/heap.cc	(working copy)
@@ -570,22 +570,6 @@
 }
 
 
-class ClearThreadNormalizedMapCachesVisitor: public ThreadVisitor {
-  virtual void VisitThread(ThreadLocalTop* top) {
-    Context* context = top->context_;
-    if (context == NULL) return;
-    context->global()->global_context()->normalized_map_cache()->Clear();
-  }
-};
-
-
-void Heap::ClearNormalizedMapCaches() {
-  if (Bootstrapper::IsActive()) return;
-  ClearThreadNormalizedMapCachesVisitor visitor;
-  ThreadManager::IterateArchivedThreads(&visitor);
-}
-
-
 #ifdef DEBUG
 
 enum PageWatermarkValidity {
@@ -776,8 +760,6 @@
   CompletelyClearInstanceofCache();
 
   if (is_compacting) FlushNumberStringCache();
-
-  ClearNormalizedMapCaches();
 }