Replace manual untagging of smi with proper Smi methods

runtime/vm/intermediate_language_ia32.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_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 6065 matching lines @@
   ASSERT(out_lo == left_lo);
   ASSERT(out_hi == left_hi);
 
   Label* deopt = NULL;
   if (CanDeoptimize()) {
     deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptBinaryMintOp);
   }
   if (locs()->in(1).IsConstant()) {
     // Code for a constant shift amount.
     ASSERT(locs()->in(1).constant().IsSmi());
-    const int32_t shift =
-        reinterpret_cast<int32_t>(locs()->in(1).constant().raw()) >> 1;
+    const int32_t shift = Smi::Cast(locs()->in(1).constant()).Value();
     ASSERT(shift >= 0);
     switch (op_kind()) {
       case Token::kSHR: {
         if (shift > 31) {
           __ movl(left_lo, left_hi);        // Shift by 32.
           __ sarl(left_hi, Immediate(31));  // Sign extend left hi.
           if (shift > 32) {
             __ sarl(left_lo, Immediate(shift > 63 ? 31 : shift - 32));
           }
         } else {
@@ skipping 688 matching lines @@
   __ Call(*StubCode::DebugStepCheck_entry());
   compiler->EmitCallsiteMetaData(token_pos(), deopt_id_, stub_kind_, locs());
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32