Do not directly load smi constants larger than a 16 bit payload on ia32.

runtime/vm/flow_graph_compiler_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/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1752 matching lines @@
       __ movups(XMM0, source.ToStackSlotAddress());
       __ movups(destination.ToStackSlotAddress(), XMM0);
     }
   } else {
     ASSERT(source.IsConstant());
     if (destination.IsRegister()) {
       const Object& constant = source.constant();
       if (constant.IsSmi() && (Smi::Cast(constant).Value() == 0)) {
         __ xorl(destination.reg(), destination.reg());
       } else {
-        __ LoadObject(destination.reg(), constant);
+        __ LoadObjectSafely(destination.reg(), constant);
       }
     } else {
       ASSERT(destination.IsStackSlot());
       StoreObject(destination.ToStackSlotAddress(), source.constant());
     }
   }
 
   move->Eliminate();
 }
 
@@ skipping 78 matching lines @@
 
 void ParallelMoveResolver::MoveMemoryToMemory(const Address& dst,
                                               const Address& src) {
   ScratchRegisterScope ensure_scratch(this, kNoRegister);
   __ movl(ensure_scratch.reg(), src);
   __ movl(dst, ensure_scratch.reg());
 }
 
 
 void ParallelMoveResolver::StoreObject(const Address& dst, const Object& obj) {
-  if (obj.IsSmi() || obj.IsNull()) {
+  if (Assembler::IsSafeSmi(obj) || obj.IsNull()) {
     __ movl(dst, Immediate(reinterpret_cast<int32_t>(obj.raw())));
   } else {
     ScratchRegisterScope ensure_scratch(this, kNoRegister);
-    __ LoadObject(ensure_scratch.reg(), obj);
+    __ LoadObjectSafely(ensure_scratch.reg(), obj);
     __ movl(dst, ensure_scratch.reg());
   }
 }
 
 
 void ParallelMoveResolver::Exchange(Register reg, const Address& mem) {
   ScratchRegisterScope ensure_scratch(this, reg);
   __ movl(ensure_scratch.reg(), mem);
   __ movl(mem, reg);
   __ movl(reg, ensure_scratch.reg());
@@ skipping 41 matching lines @@
   __ movups(reg, Address(ESP, 0));
   __ addl(ESP, Immediate(kFpuRegisterSize));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32