Take all uses into account to clear int32 truncation.

src/hydrogen.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 3177 matching lines @@
   }
 
   for (int i = 0; i < phi_list()->length(); i++) {
     HPhi* phi = phi_list()->at(i);
     for (HUseIterator it(phi->uses()); !it.Done(); it.Advance()) {
       // If a Phi is used as a non-truncating int32 or as a double,
       // clear its "truncating" flag.
       HValue* use = it.value();
       Representation input_representation =
           use->RequiredInputRepresentation(it.index());
-      if ((input_representation.IsInteger32() &&
-           !use->CheckFlag(HValue::kTruncatingToInt32)) ||
-          input_representation.IsDouble()) {
+      if (!input_representation.IsInteger32() ||
+          !use->CheckFlag(HValue::kTruncatingToInt32)) {
         if (FLAG_trace_representation) {
           PrintF("#%d Phi is not truncating because of #%d %s\n",
                  phi->id(), it.value()->id(), it.value()->Mnemonic());
         }
         phi->ClearFlag(HValue::kTruncatingToInt32);
         worklist.Add(phi, zone());
         break;
       }
     }
   }
@@ skipping 8390 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal