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

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index a6d782e44d92b52c9a985493d6ecbde03331311b..30f8a8dfbb8cec982fdee21e9308de9c10726746 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -225,6 +225,9 @@ class MacroAssembler: public Assembler {
   void DebugBreak();
 #endif
 
+  // Generates function and stub prologue code.
+  void Prologue(PrologueFrameMode frame_mode);
+
   // Enter specific kind of exit frame. Expects the number of
   // arguments in register eax and sets up the number of arguments in
   // register edi and the pointer to the first argument in register