Cache optimized code for OSR.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index 578d580159a21fbab3a92dd8bb109e7eb985a32c..4f57e9b12dd7ffc29fd9f2f2c79da63ab22438aa 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -1070,7 +1070,8 @@ void CodeFlusher::ProcessOptimizedCodeMaps() {
   static const int kContextOffset = 0;
   static const int kCodeOffset = 1;
   static const int kLiteralsOffset = 2;
-  STATIC_ASSERT(kEntryLength == 3);
+  static const int kOsrAstIdOffset = 3;
+  STATIC_ASSERT(kEntryLength == 4);
 
   SharedFunctionInfo* holder = optimized_code_map_holder_head_;
   SharedFunctionInfo* next_holder;
@@ -1114,6 +1115,10 @@ void CodeFlusher::ProcessOptimizedCodeMaps() {
           Marking::MarkBitFrom(HeapObject::cast(*literals_slot))));
       isolate_->heap()->mark_compact_collector()->
           RecordSlot(literals_slot, literals_slot, *literals_slot);
+
+      // Update OSR AST id.  No write barrier necessary for a smi.
+      ASSERT(code_map->get(i + kOsrAstIdOffset)->IsSmi());
+      code_map->set(new_length++, code_map->get(i + kOsrAstIdOffset));
     }
 
     // Trim the optimized code map if entries have been removed.