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

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1107 matching lines @@
   // Initialize a filler object to keep the ability to iterate over the heap
   // when shortening objects.
   void CreateFillerObjectAt(Address addr, int size);
 
   // Makes a new native code object
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed. On success, the pointer to the Code object is stored in the
   // self_reference. This allows generated code to reference its own Code
   // object by containing this pointer.
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* CreateCode(const CodeDesc& desc,
-                                          Code::Flags flags,
-                                          Handle<Object> self_reference,
-                                          bool immovable = false,
-                                          bool crankshafted = false);
+  MUST_USE_RESULT MaybeObject* CreateCode(
+      const CodeDesc& desc,
+      Code::Flags flags,
+      Handle<Object> self_reference,
+      bool immovable = false,
+      bool crankshafted = false,
+      int prologue_offset = Code::kPrologueOffsetNotSet);
 
   MUST_USE_RESULT MaybeObject* CopyCode(Code* code);
 
   // Copy the code and scope info part of the code object, but insert
   // the provided data as the relocation information.
   MUST_USE_RESULT MaybeObject* CopyCode(Code* code, Vector<byte> reloc_info);
 
   // Finds the internalized copy for string in the string table.
   // If not found, a new string is added to the table and returned.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if allocation
@@ skipping 1933 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_