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

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 2bbbd98ac07e81e720532813fa29a04aaf529ad1..d2dbfe2815ba39fd116a4c25c130d9f5e2b2dfb3 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -922,6 +922,13 @@ class StackFrameLocator BASE_EMBEDDED {
 };
 
 
+// Used specify the type of prologue to generate.
+enum PrologueFrameMode {
+  BUILD_FUNCTION_FRAME,
+  BUILD_STUB_FRAME
+};
+
+
 // Reads all frames on the current stack and copies them into the current
 // zone memory.
 Vector<StackFrame*> CreateStackMap(Isolate* isolate, Zone* zone);