Ensure constant truncation is only done when it is safe.

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 2557 matching lines @@
   if (has_int32_value_) {
     res = new(zone) HConstant(int32_value_,
                               Representation::Integer32(),
                               is_not_in_new_space_,
                               handle_);
   } else if (has_double_value_) {
     res = new(zone) HConstant(DoubleToInt32(double_value_),
                               Representation::Integer32(),
                               is_not_in_new_space_,
                               handle_);
-  } else {
-    ASSERT(!HasNumberValue());
-    Maybe<HConstant*> number = CopyToTruncatedNumber(zone);
-    if (number.has_value) return number.value->CopyToTruncatedInt32(zone);
   }
   return Maybe<HConstant*>(res != NULL, res);
 }
 
 
 Maybe<HConstant*> HConstant::CopyToTruncatedNumber(Zone* zone) {
   HConstant* res = NULL;
   Handle<Object> handle = this->handle(zone->isolate());
   if (handle->IsBoolean()) {
     res = handle->BooleanValue() ?
@@ skipping 1648 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal