Replaced unreachable code in DoStoreNamedField by an assertion.

src/arm64/lithium-codegen-arm64.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 1249 matching lines @@
   return constant->handle(isolate());
 }
 
 
 bool LCodeGen::IsSmi(LConstantOperand* op) const {
   return chunk_->LookupLiteralRepresentation(op).IsSmi();
 }
 
 
 bool LCodeGen::IsInteger32Constant(LConstantOperand* op) const {
-  return op->IsConstantOperand() &&
-      chunk_->LookupLiteralRepresentation(op).IsSmiOrInteger32();
+  return chunk_->LookupLiteralRepresentation(op).IsSmiOrInteger32();
 }
 
 
 int32_t LCodeGen::ToInteger32(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
   return constant->Integer32Value();
 }
 
 
 double LCodeGen::ToDouble(LConstantOperand* op) const {
@@ skipping 3952 matching lines @@
     FPRegister value = ToDoubleRegister(instr->value());
     __ Str(value, FieldMemOperand(object, offset));
     return;
   }
 
   Register value = ToRegister(instr->value());
 
   SmiCheck check_needed = instr->hydrogen()->value()->IsHeapObject()
       ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
 
+  ASSERT(!(representation.IsSmi() &&
+           instr->value()->IsConstantOperand() &&
+           !IsInteger32Constant(LConstantOperand::cast(instr->value()))));
   if (representation.IsHeapObject() &&
       !instr->hydrogen()->value()->type().IsHeapObject()) {
     DeoptimizeIfSmi(value, instr->environment());
 
     // We know that value is a smi now, so we can omit the check below.
     check_needed = OMIT_SMI_CHECK;
   }
 
   if (!transition.is_null()) {
     // Store the new map value.
@@ skipping 600 matching lines @@
   __ Bind(&out_of_object);
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal