Maintain a FixedArray for the optimized code map.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 08d44f5bb962d48949acaa6a87577dac6788afab..bdc92c01cd2f956e4efbd7edd8741858ecc80828 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2786,6 +2786,17 @@ void Heap::CreateInitialObjects() {
     set_dummy_vector(*dummy_vector);
   }
 
+  {
+    Handle<FixedArray> cleared_optimized_code_map =
+        factory->NewFixedArray(SharedFunctionInfo::kEntriesStart, TENURED);
+    DCHECK(SharedFunctionInfo::kEntriesStart == 1 &&

[Michael Starzinger, 2015/11/13 12:14:22]

nit: Could be turned into a STATIC_ASSERT instead.

[mvstanton, 2015/11/17 20:32:12]

Done.

+           SharedFunctionInfo::kSharedCodeIndex == 0);
+    cleared_optimized_code_map->set(SharedFunctionInfo::kSharedCodeIndex,

[Michael Starzinger, 2015/11/13 12:14:22]

The field is already initialized to undefined, because Factory::NewFixedArray
produces an initialed array. Explicitly setting this field is not needed.

[mvstanton, 2015/11/17 20:32:12]

Done.

+                                    *factory->undefined_value(),
+                                    SKIP_WRITE_BARRIER);
+    set_cleared_optimized_code_map(*cleared_optimized_code_map);
+  }
+
   set_detached_contexts(empty_fixed_array());
   set_retained_maps(ArrayList::cast(empty_fixed_array()));