On Ia32 optimistically assume that results from int32 and uint32 array loads fit into Smi. Only if …

runtime/vm/code_generator.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_CODE_GENERATOR_H_
 #define VM_CODE_GENERATOR_H_
 
 #include "vm/globals.h"
 #include "vm/runtime_entry.h"
 
@@ skipping 55 matching lines @@
   V(RelationalOp)                                                              \
   V(EqualityClassCheck)                                                        \
   V(NoTypeFeedback)                                                            \
   V(UnaryOp)                                                                   \
   V(UnboxInteger)                                                              \
   V(CheckClass)                                                                \
   V(CheckSmi)                                                                  \
   V(CheckArrayBound)                                                           \
   V(AtCall)                                                                    \
   V(DoubleToSmi)                                                               \
+  V(Int32Load)                                                                 \
+  V(Uint32Load)                                                                \
   V(NumReasons)                                                                \
 
 enum DeoptReasonId {
 #define DEFINE_ENUM_LIST(name) kDeopt##name,
 DEOPT_REASONS(DEFINE_ENUM_LIST)
 #undef DEFINE_ENUM_LIST
 };
 
 
 const char* DeoptReasonToText(intptr_t deopt_id);
 
 
 RawCode* ResolveCompileInstanceCallTarget(
     const Instance& receiver,
     const ICData& ic_data,
     const Array& arguments_descriptor);
 
 void DeoptimizeAll();
 void DeoptimizeIfOwner(const GrowableArray<intptr_t>& classes);
 
 }  // namespace dart
 
 #endif  // VM_CODE_GENERATOR_H_