Fix code for store buffer update on ARM and MIPS (link register was trashed).

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/runtime_entry.h"
 #include "vm/simulator.h"
@@ skipping 246 matching lines @@
                                 bool can_value_be_smi) {
   ASSERT(object != value);
   sw(value, dest);
   Label done;
   if (can_value_be_smi) {
     StoreIntoObjectFilter(object, value, &done);
   } else {
     StoreIntoObjectFilterNoSmi(object, value, &done);
   }
   // A store buffer update is required.
-  if (value != T0) Push(T0);  // Preserve T0.
+  if (value != T0) {
+    // Preserve T0.
+    addiu(SP, SP, Immediate(-2 * kWordSize));
+    sw(T0, Address(SP, 1 * kWordSize));
+  } else {
+    addiu(SP, SP, Immediate(-1 * kWordSize));
+  }
+  sw(RA, Address(SP, 0 * kWordSize));
   if (object != T0) {
     mov(T0, object);
   }
   BranchLink(&StubCode::UpdateStoreBufferLabel());
-  if (value != T0) Pop(T0);  // Restore T0.
+  lw(RA, Address(SP, 0 * kWordSize));
+  if (value != T0) {
+    // Restore T0.
+    lw(T0, Address(SP, 1 * kWordSize));
+    addiu(SP, SP, Immediate(2 * kWordSize));
+  } else {
+    addiu(SP, SP, Immediate(1 * kWordSize));
+  }
   Bind(&done);
 }
 
 
 void Assembler::StoreIntoObjectNoBarrier(Register object,
                                          const Address& dest,
                                          Register value) {
   sw(value, dest);
 #if defined(DEBUG)
   Label done;
@@ skipping 380 matching lines @@
     Bind(&msg);
     break_(Instr::kMsgMessageCode);
   }
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS