Fix dictionary element load to pass correct elements kind.

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 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 2763 matching lines @@
 
   Register result = ToRegister(instr->result());
   if (!access.IsInobject()) {
     __ movp(result, FieldOperand(object, JSObject::kPropertiesOffset));
     object = result;
   }
 
   Representation representation = access.representation();
   if (representation.IsSmi() &&
       instr->hydrogen()->representation().IsInteger32()) {
+#ifdef DEBUG
+    Register scratch = kScratchRegister;
+    __ Load(scratch, FieldOperand(object, offset), representation);
+    __ AssertSmi(scratch);
+#endif
+
     // Read int value directly from upper half of the smi.
     STATIC_ASSERT(kSmiTag == 0);
     STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
     offset += kPointerSize / 2;
     representation = Representation::Integer32();
   }
   __ Load(result, FieldOperand(object, offset), representation);
 }
 
 
@@ skipping 225 matching lines @@
     }
   }
 
   bool requires_hole_check = hinstr->RequiresHoleCheck();
   int offset = FixedArray::kHeaderSize - kHeapObjectTag;
   Representation representation = hinstr->representation();
 
   if (representation.IsInteger32() &&
       hinstr->elements_kind() == FAST_SMI_ELEMENTS) {
     ASSERT(!requires_hole_check);
+#ifdef DEBUG
+    Register scratch = kScratchRegister;
+    __ Load(scratch,
+            BuildFastArrayOperand(instr->elements(),
+                                  key,
+                                  FAST_ELEMENTS,
+                                  offset,
+                                  instr->additional_index()),
+            Representation::Smi());
+    __ AssertSmi(scratch);
+#endif
     // Read int value directly from upper half of the smi.
     STATIC_ASSERT(kSmiTag == 0);
     STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
     offset += kPointerSize / 2;
   }
 
   __ Load(result,
           BuildFastArrayOperand(instr->elements(),
                                 key,
                                 FAST_ELEMENTS,
@@ skipping 2513 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64