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

runtime/vm/assembler_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"
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/heap.h"
@@ skipping 1927 matching lines @@
   } else {
     ASSERT(object.IsNotTemporaryScopedHandle());
     ASSERT(object.IsOld());
     AssemblerBuffer::EnsureCapacity ensured(&buffer_);
     EmitUint8(0xB8 + dst);
     buffer_.EmitObject(object);
   }
 }
 
 
+void Assembler::LoadObjectSafely(Register dst, const Object& object) {
+  if (Assembler::IsSafe(object)) {
+    LoadObject(dst, object);
+  } else {
+    movl(dst,
+         Immediate(reinterpret_cast<int32_t>(object.raw()) ^ jit_cookie_));
+    xorl(dst, Immediate(jit_cookie_));
+  }
+}
+
+
 void Assembler::PushObject(const Object& object) {
   if (object.IsSmi() || object.InVMHeap()) {
     pushl(Immediate(reinterpret_cast<int32_t>(object.raw())));
   } else {
     ASSERT(object.IsNotTemporaryScopedHandle());
     ASSERT(object.IsOld());
     AssemblerBuffer::EnsureCapacity ensured(&buffer_);
     EmitUint8(0x68);
     buffer_.EmitObject(object);
   }
@@ skipping 538 matching lines @@
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
   return xmm_reg_names[reg];
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32