ARM: make sure that the expected code size is computed in predictable scope.

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 140 matching lines @@
  private:
   AssemblerBase* assembler_;
   bool old_value_;
 };
 
 
 // Avoids using instructions that vary in size in unpredictable ways between the
 // snapshot and the running VM.
 class PredictableCodeSizeScope {
  public:
+  explicit PredictableCodeSizeScope(AssemblerBase* assembler);
   PredictableCodeSizeScope(AssemblerBase* assembler, int expected_size);
   ~PredictableCodeSizeScope();
+  void ExpectSize(int expected_size) { expected_size_ = expected_size; }
 
  private:
   AssemblerBase* assembler_;
   int expected_size_;
   int start_offset_;
   bool old_value_;
 };
 
 
 // Enable a specified feature within a scope.
@@ skipping 1091 matching lines @@
   };
 
   Label emitted_label_;  // Records pc_offset of emitted pool
   PerTypeEntryInfo info_[ConstantPoolEntry::NUMBER_OF_TYPES];
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_