Fixes bug in mips left shift.

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 "lib/error.h"
@@ skipping 2242 matching lines @@
           !right_range->IsWithin(0, RangeBoundary::kPlusInfinity);
       if (right_may_be_negative) {
         ASSERT(shift_left->CanDeoptimize());
         __ bltz(right, deopt);
       }
       Label done, is_not_zero;
 
       __ sltiu(CMPRES,
           right, Immediate(reinterpret_cast<int32_t>(Smi::New(Smi::kBits))));
       __ movz(result, ZR, CMPRES);  // result = right >= kBits ? 0 : result.
-      __ mov(TMP1, right);
-      __ SmiUntag(TMP1);
+      __ sra(TMP1, right, kSmiTagSize);
       __ sllv(TMP1, left, TMP1);
       // result = right < kBits ? left << right : result.
       __ movn(result, TMP1, CMPRES);
     } else {
       __ sra(TMP, right, kSmiTagSize);
       __ sllv(result, left, TMP);
     }
   } else {
     if (right_needs_check) {
       ASSERT(shift_left->CanDeoptimize());
       __ BranchUnsignedGreaterEqual(
           right, reinterpret_cast<int32_t>(Smi::New(Smi::kBits)), deopt);
     }
     // Left is not a constant.
     // Check if count too large for handling it inlined.
     __ sra(TMP, right, kSmiTagSize);  // SmiUntag right into TMP.
     // Overflow test (preserve left, right, and TMP);
     Register temp = locs.temp(0).reg();
     __ sllv(temp, left, TMP);
     __ srav(temp, temp, TMP);
     __ bne(temp, left, deopt);  // Overflow.
     // Shift for result now we know there is no overflow.
-    __ sll(result, left, TMP);
+    __ sllv(result, left, TMP);
   }
 }
 
 
 LocationSummary* BinarySmiOpInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = op_kind() == Token::kADD ? 1 : 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   if (op_kind() == Token::kTRUNCDIV) {
@@ skipping 1436 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS