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

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index d166c2a14baef9cf3d3426a622c2f344cb83a30b..2d9e52a8e3e23de7e30c25f766cb43b58aec5b39 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -35,8 +35,6 @@
 namespace v8 {
 namespace internal {
 
-static const int kPrologueOffsetNotSet = -1;
-
 class ScriptDataImpl;
 class HydrogenCodeStub;
 
@@ -269,12 +267,12 @@ class CompilationInfo {
   void set_bailout_reason(BailoutReason reason) { bailout_reason_ = reason; }
 
   int prologue_offset() const {
-    ASSERT_NE(kPrologueOffsetNotSet, prologue_offset_);
+    ASSERT_NE(Code::kPrologueOffsetNotSet, prologue_offset_);
     return prologue_offset_;
   }
 
   void set_prologue_offset(int prologue_offset) {
-    ASSERT_EQ(kPrologueOffsetNotSet, prologue_offset_);
+    ASSERT_EQ(Code::kPrologueOffsetNotSet, prologue_offset_);
     prologue_offset_ = prologue_offset;
   }