Flatten property_kind into state. Add UNKNOWN as a state for dict-mode receivers

src/ic/x64/handler-compiler-x64.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ic/call-optimization.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 676 matching lines @@
   DCHECK(holder_reg.is(receiver()) || holder_reg.is(scratch1()));
 
   // Preserve the receiver register explicitly whenever it is different from the
   // holder and it is needed should the interceptor return without any result.
   // The ACCESSOR case needs the receiver to be passed into C++ code, the FIELD
   // case might cause a miss during the prototype check.
   bool must_perform_prototype_check =
       !holder().is_identical_to(it->GetHolder<JSObject>());
   bool must_preserve_receiver_reg =
       !receiver().is(holder_reg) &&
-      (it->property_kind() == LookupIterator::ACCESSOR ||
-       must_perform_prototype_check);
+      (it->state() == LookupIterator::ACCESSOR || must_perform_prototype_check);
 
   // Save necessary data before invoking an interceptor.
   // Requires a frame to make GC aware of pushed pointers.
   {
     FrameScope frame_scope(masm(), StackFrame::INTERNAL);
 
     if (must_preserve_receiver_reg) {
       __ Push(receiver());
     }
     __ Push(holder_reg);
@@ skipping 118 matching lines @@
   // Return the generated code.
   return GetCode(kind(), Code::NORMAL, name);
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64