Simplify the LookupIterator

src/runtime.cc

 // Copyright 2012 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 <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 10909 matching lines @@
   return isolate->heap()->undefined_value();
 }
 
 
 static Handle<Object> DebugGetProperty(LookupIterator* it,
                                        bool* has_caught = NULL) {
   for (; it->IsFound(); it->Next()) {
     switch (it->state()) {
       case LookupIterator::NOT_FOUND:
       case LookupIterator::TRANSITION:
-      case LookupIterator::UNKNOWN:
         UNREACHABLE();
       case LookupIterator::ACCESS_CHECK:
         // Ignore access checks.
         break;
       case LookupIterator::INTERCEPTOR:
       case LookupIterator::JSPROXY:
         return it->isolate()->factory()->undefined_value();
       case LookupIterator::ACCESSOR: {
         Handle<Object> accessors = it->GetAccessors();
         if (!accessors->IsAccessorInfo()) {
@@ skipping 4740 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal