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

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 30a617b634823a2a8cb6c3eab73775bc74748a00..49071cbe04cf6d69eb5a3b54a567fe448efef792 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -539,6 +539,8 @@ class MacroAssembler: public Assembler {
                          LowDwVfpRegister double_scratch1,
                          Label* not_int32);
 
+  // Generates function and stub prologue code.
+  void Prologue(bool is_stub);
 
   // Enter exit frame.
   // stack_space - extra stack space, used for alignment before call to C.