Fixes typo in mips causing test failures.

runtime/vm/intermediate_language_mips.cc

 // 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.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 2303 matching lines @@
 
     compiler->SaveLiveRegisters(locs);
 
     __ LoadImmediate(T1, instruction_->num_context_variables());
     StubCode* stub_code = compiler->isolate()->stub_code();
     const ExternalLabel label(stub_code->AllocateContextEntryPoint());
     compiler->GenerateCall(instruction_->token_pos(),
                            &label,
                            RawPcDescriptors::kOther,
                            locs);
-    ASSERT(instruction_->locs()->out(0).reg() == R0);
+    ASSERT(instruction_->locs()->out(0).reg() == V0);
     compiler->RestoreLiveRegisters(instruction_->locs());
     __ b(exit_label());
   }
 
  private:
   AllocateUninitializedContextInstr* instruction_;
 };
 
 
 void AllocateUninitializedContextInstr::EmitNativeCode(
@@ skipping 2491 matching lines @@
   compiler->GenerateCall(token_pos(), &label, stub_kind_, locs());
 #if defined(DEBUG)
   __ LoadImmediate(S4, kInvalidObjectPointer);
   __ LoadImmediate(S5, kInvalidObjectPointer);
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS