VM: Fix a couple of issues in the AOT optimizer, add fast path smi multiply.

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/compiler.h"
@@ skipping 2934 matching lines @@
   __ bne(CMPRES1, ZR, slow_path->entry_label());
   switch (op_kind()) {
     case Token::kADD:
       __ AdduDetectOverflow(result, left, right, CMPRES1);
       __ bltz(CMPRES1, slow_path->entry_label());
       break;
     case Token::kSUB:
       __ SubuDetectOverflow(result, left, right, CMPRES1);
       __ bltz(CMPRES1, slow_path->entry_label());
       break;
+    case Token::kMUL:
+      __ sra(TMP, left, kSmiTagSize);
+      __ mult(TMP, right);
+      __ mflo(result);
+      __ mfhi(CMPRES2);
+      __ sra(CMPRES1, result, 31);
+      __ bne(CMPRES1, CMPRES2, slow_path->entry_label());
+      break;
     case Token::kBIT_OR:
       // Operation part of combined smi check.
       if (!combined_smi_check) {
         __ or_(result, left, right);
       }
       break;
     case Token::kBIT_AND:
       __ and_(result, left, right);
       break;
     case Token::kBIT_XOR:
@@ skipping 2737 matching lines @@
                                 1,
                                 locs());
   __ lw(result, Address(SP, 1 * kWordSize));
   __ addiu(SP, SP, Immediate(2 * kWordSize));
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS