Optionally use 31-bits SMI value for 64-bit system

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2387 matching lines @@
     is_not_in_new_space_(true),
     is_cell_(false),
     boolean_value_(true),
     external_reference_value_(reference) {
   Initialize(Representation::External());
 }
 
 
 void HConstant::Initialize(Representation r) {
   if (r.IsNone()) {
-    if (has_smi_value_ && kSmiValueSize == 31) {
+    if (has_smi_value_ && SmiValuesAre31Bits()) {
       r = Representation::Smi();
     } else if (has_int32_value_) {
       r = Representation::Integer32();
     } else if (has_double_value_) {
       r = Representation::Double();
     } else if (has_external_reference_value_) {
       r = Representation::External();
     } else {
       r = Representation::Tagged();
     }
@@ skipping 1698 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal