Enable preaging of code objects when --optimize-for-size.

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index 682fa1ca5ba52c1d65c8349b4fbf589a5d70f46e..92dcf6f4edf54e4d10e556bcce7bcae8972d8d49 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -218,6 +218,11 @@ enum BuiltinExtraArguments {
                                     Code::kNoExtraICState)              \
   V(StackCheck,                     BUILTIN, UNINITIALIZED,             \
                                     Code::kNoExtraICState)              \
+                                                                        \
+  V(MarkCodeAsExecutedOnce,         BUILTIN, UNINITIALIZED,             \
+                                    Code::kNoExtraICState)              \
+  V(MarkCodeAsExecutedTwice,        BUILTIN, UNINITIALIZED,             \
+                                    Code::kNoExtraICState)              \
   CODE_AGE_LIST_WITH_ARG(DECLARE_CODE_AGE_BUILTIN, V)
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
@@ -411,6 +416,9 @@ class Builtins {
   CODE_AGE_LIST(DECLARE_CODE_AGE_BUILTIN_GENERATOR)
 #undef DECLARE_CODE_AGE_BUILTIN_GENERATOR
 
+  static void Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm);
+  static void Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm);
+
   static void InitBuiltinFunctionTable();
 
   bool initialized_;