[Isolates] Merge r 6300:6500 from bleeding_edge to isolates.

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 6955)
+++ src/heap.cc	(working copy)
@@ -35,6 +35,7 @@
 #include "debug.h"
 #include "heap-profiler.h"
 #include "global-handles.h"
+#include "liveobjectlist-inl.h"
 #include "mark-compact.h"
 #include "natives.h"
 #include "objects-visiting.h"
@@ -393,6 +394,8 @@
 #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING)
   ReportStatisticsBeforeGC();
 #endif
+
+  LiveObjectList::GCPrologue();
 }
 
 intptr_t Heap::SizeOfObjects() {
@@ -405,6 +408,7 @@
 }
 
 void Heap::GarbageCollectionEpilogue() {
+  LiveObjectList::GCEpilogue();
 #ifdef DEBUG
   allow_allocation(true);
   ZapFromSpace();
@@ -1034,6 +1038,8 @@
   UpdateNewSpaceReferencesInExternalStringTable(
       &UpdateNewSpaceReferenceInExternalStringTableEntry);
 
+  LiveObjectList::UpdateReferencesForScavengeGC();
+
   ASSERT(new_space_front == new_space_.top());
 
   is_safe_to_read_maps_ = true;