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 736487834d8210721f1308f530991803e40c9aae..c1c8a5db5124225905db4a7c5d309b4d11943db1 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -204,6 +204,11 @@ 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)
 
 // Define list of builtin handlers implemented in assembly.
@@ -413,6 +418,9 @@ 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_;