Fixes bug in far branches on MIPS.

runtime/vm/assembler_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"
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
@@ skipping 167 matching lines @@
   EmitFarJump(offset, false);
 }
 
 
 void Assembler::EmitBranch(Opcode b, Register rs, Register rt, Label* label) {
   if (label->IsBound()) {
     // Relative destination from an instruction after the branch.
     const int32_t dest =
         label->Position() - (buffer_.Size() + Instr::kInstrSize);
     if (use_far_branches() && !CanEncodeBranchOffset(dest)) {
-      EmitFarBranch(b, rs, rt, label->Position());
+      EmitFarBranch(OppositeBranchOpcode(b), rs, rt, label->Position());
     } else {
       const uint16_t dest_off = EncodeBranchOffset(dest, 0);
       EmitIType(b, rs, rt, dest_off);
     }
   } else {
     const intptr_t position = buffer_.Size();
     if (use_far_branches()) {
       const uint32_t dest_off = label->position_;
       EmitFarBranch(b, rs, rt, dest_off);
     } else {
       const uint16_t dest_off = EncodeBranchOffset(label->position_, 0);
       EmitIType(b, rs, rt, dest_off);
     }
     label->LinkTo(position);
   }
 }
 
 
 void Assembler::EmitRegImmBranch(RtRegImm b, Register rs, Label* label) {
   if (label->IsBound()) {
     // Relative destination from an instruction after the branch.
     const int32_t dest =
         label->Position() - (buffer_.Size() + Instr::kInstrSize);
     if (use_far_branches() && !CanEncodeBranchOffset(dest)) {
-      EmitFarRegImmBranch(b, rs, label->Position());
+      EmitFarRegImmBranch(OppositeBranchNoLink(b), rs, label->Position());
     } else {
       const uint16_t dest_off = EncodeBranchOffset(dest, 0);
       EmitRegImmType(REGIMM, rs, b, dest_off);
     }
   } else {
     const intptr_t position = buffer_.Size();
     if (use_far_branches()) {
       const uint32_t dest_off = label->position_;
       EmitFarRegImmBranch(b, rs, dest_off);
     } else {
@@ skipping 742 matching lines @@
     Emit(reinterpret_cast<int32_t>(message));
     Bind(&msg);
     break_(Instr::kMsgMessageCode);
   }
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS