Adds native/leaf runtime call stub and redirection 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.
@@ skipping 28 matching lines @@
   const Array& object_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(CallPattern);
 };
 
 
 class JumpPattern : public ValueObject {
  public:
   explicit JumpPattern(uword pc);
 
-  static const int kLengthInBytes = 3*Instr::kInstrSize;
+  // lui; ori; jr; nop (in delay slot) = 4.
+  static const int kLengthInBytes = 4*Instr::kInstrSize;
 
   int pattern_length_in_bytes() const {
     return kLengthInBytes;
   }
 
   bool IsValid() const;
   uword TargetAddress() const;
   void SetTargetAddress(uword target_address) const;
 
  private:
   const uword pc_;
 
   DISALLOW_COPY_AND_ASSIGN(JumpPattern);
 };
 
 }  // namespace dart
 
 #endif  // VM_INSTRUCTIONS_MIPS_H_