Enables optimization on MIPS

runtime/vm/instructions_mips.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Classes that describe assembly patterns as used by inline caches.
 
 #ifndef VM_INSTRUCTIONS_MIPS_H_
 #define VM_INSTRUCTIONS_MIPS_H_
 
 #ifndef VM_INSTRUCTIONS_H_
 #error Do not include instructions_mips.h directly; use instructions.h instead.
 #endif
 
 #include "vm/constants_mips.h"
 #include "vm/object.h"
 
 namespace dart {
 
 class CallPattern : public ValueObject {
  public:
   CallPattern(uword pc, const Code& code);
 
   RawICData* IcData();
   RawArray* ArgumentsDescriptor();
 
   uword TargetAddress() const;
   void SetTargetAddress(uword target_address) const;
 
+  // This constant length is only valid for inserted call patterns used for
+  // lazy deoptimization. Regular call pattern may vary in length.
+  static const int kFixedLengthInBytes = 3 * Instr::kInstrSize;
+
  private:
   uword Back(int n) const;
   int DecodeLoadObject(int end, Register* reg, Object* obj);
   int DecodeLoadWordImmediate(int end, Register* reg, int* value);
   int DecodeLoadWordFromPool(int end, Register* reg, int* index);
   const uword* end_;
   int target_address_pool_index_;
   int args_desc_load_end_;
   Array& args_desc_;
   int ic_data_load_end_;
@@ skipping 22 matching lines @@
  private:
   const uword pc_;
 
   DISALLOW_COPY_AND_ASSIGN(JumpPattern);
 };
 
 }  // namespace dart
 
 #endif  // VM_INSTRUCTIONS_MIPS_H_