Replaced unreachable code in DoStoreNamedField by an assertion.

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 391 matching lines @@
 }
 
 
 XMMRegister LCodeGen::ToDoubleRegister(LOperand* op) const {
   ASSERT(op->IsDoubleRegister());
   return ToDoubleRegister(op->index());
 }
 
 
 bool LCodeGen::IsInteger32Constant(LConstantOperand* op) const {
-  return op->IsConstantOperand() &&
-      chunk_->LookupLiteralRepresentation(op).IsSmiOrInteger32();
+  return chunk_->LookupLiteralRepresentation(op).IsSmiOrInteger32();
 }
 
 
 bool LCodeGen::IsSmiConstant(LConstantOperand* op) const {
-  return op->IsConstantOperand() &&
-      chunk_->LookupLiteralRepresentation(op).IsSmi();
+  return chunk_->LookupLiteralRepresentation(op).IsSmi();
 }
 
 
-bool LCodeGen::IsTaggedConstant(LConstantOperand* op) const {
-  return op->IsConstantOperand() &&
-      chunk_->LookupLiteralRepresentation(op).IsTagged();
-}
-
-
 int32_t LCodeGen::ToInteger32(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
   return constant->Integer32Value();
 }
 
 
 Smi* LCodeGen::ToSmi(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
   return Smi::FromInt(constant->Integer32Value());
 }
@@ skipping 3509 matching lines @@
       __ Store(MemOperand(object, offset), value, representation);
     }
     return;
   }
 
   Register object = ToRegister(instr->object());
   Handle<Map> transition = instr->transition();
   SmiCheck check_needed = hinstr->value()->IsHeapObject()
                           ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
 
-  if (representation.IsSmi()) {
-    if (instr->value()->IsConstantOperand()) {
-      LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
-      if (!IsInteger32Constant(operand_value) &&
-          !IsSmiConstant(operand_value)) {
-        DeoptimizeIf(no_condition, instr->environment());
-      }
-    }
-  } else if (representation.IsHeapObject()) {
+  ASSERT(!(representation.IsSmi() &&
+           instr->value()->IsConstantOperand() &&
+           !IsInteger32Constant(LConstantOperand::cast(instr->value()))));
+  if (representation.IsHeapObject()) {
     if (instr->value()->IsConstantOperand()) {
       LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
       if (IsInteger32Constant(operand_value)) {
         DeoptimizeIf(no_condition, instr->environment());
       }
     } else {
       if (!hinstr->value()->type().IsHeapObject()) {
         Register value = ToRegister(instr->value());
         Condition cc = masm()->CheckSmi(value);
         DeoptimizeIf(cc, instr->environment());
@@ skipping 1682 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64