Fixes ABI bug in MIPS.

runtime/vm/assembler_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.
 
 #ifndef VM_ASSEMBLER_MIPS_H_
 #define VM_ASSEMBLER_MIPS_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_mips.h directly; use assembler.h instead.
 #endif
@@ skipping 778 matching lines @@
   }
 
   void Branch(const ExternalLabel* label) {
     LoadImmediate(TMP, label->address());
     jr(TMP);
   }
 
   void BranchPatchable(const ExternalLabel* label) {
     const uint16_t low = Utils::Low16Bits(label->address());
     const uint16_t high = Utils::High16Bits(label->address());
-    lui(TMP, Immediate(high));
-    ori(TMP, TMP, Immediate(low));
-    jr(TMP);
+    lui(T9, Immediate(high));
+    ori(T9, T9, Immediate(low));
+    jr(T9);
     delay_slot_available_ = false;  // CodePatcher expects a nop.
   }
 
   void BranchLink(const ExternalLabel* label) {
-    LoadImmediate(TMP, label->address());
-    jalr(TMP);
+    LoadImmediate(T9, label->address());
+    jalr(T9);
   }
 
   void BranchLinkPatchable(const ExternalLabel* label) {
     const int32_t offset =
         Array::data_offset() + 4*AddExternalLabel(label) - kHeapObjectTag;
-    LoadWordFromPoolOffset(TMP, offset);
-    jalr(TMP);
+    LoadWordFromPoolOffset(T9, offset);
+    jalr(T9);
     delay_slot_available_ = false;  // CodePatcher expects a nop.
   }
 
   void Drop(intptr_t stack_elements) {
     ASSERT(stack_elements >= 0);
     if (stack_elements > 0) {
       addiu(SP, SP, Immediate(stack_elements * kWordSize));
     }
   }
 
@@ skipping 477 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_MIPS_H_