Fix decoding of object pool access in code patching on ARM.

runtime/vm/intermediate_language_arm.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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 2073 matching lines @@
   Register result = locs.out().reg();
   Label* deopt = shift_left->CanDeoptimize() ?
       compiler->AddDeoptStub(shift_left->deopt_id(), kDeoptBinarySmiOp) : NULL;
   if (locs.in(1).IsConstant()) {
     const Object& constant = locs.in(1).constant();
     ASSERT(constant.IsSmi());
     // Immediate shift operation takes 5 bits for the count.
     const intptr_t kCountLimit = 0x1F;
     const intptr_t value = Smi::Cast(constant).Value();
     if (value == 0) {
-      // No code needed.
+      __ MoveRegister(result, left);
     } else if ((value < 0) || (value >= kCountLimit)) {
       // This condition may not be known earlier in some cases because
       // of constant propagation, inlining, etc.
       if ((value >= kCountLimit) && is_truncating) {
         __ mov(result, ShifterOperand(0));
       } else {
         // Result is Mint or exception.
         __ b(deopt);
       }
     } else {
@@ skipping 160 matching lines @@
           }
           // IP: result bits 32..63.
           __ cmp(IP, ShifterOperand(result, ASR, 31));
           __ b(deopt, NE);
         }
         break;
       }
       case Token::kTRUNCDIV: {
         const intptr_t value = Smi::Cast(constant).Value();
         if (value == 1) {
-          // Do nothing.
+          __ MoveRegister(result, left);
           break;
         } else if (value == -1) {
           // Check the corner case of dividing the 'MIN_SMI' with -1, in which
           // case we cannot negate the result.
           __ CompareImmediate(left, 0x80000000);
           __ b(deopt, EQ);
           __ rsb(result, left, ShifterOperand(0));
           break;
         }
         ASSERT((value != 0) && Utils::IsPowerOfTwo(Utils::Abs(value)));
@@ skipping 1293 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM