Simplify the LookupIterator

src/ic/handler-compiler.cc

Index: src/ic/handler-compiler.cc
diff --git a/src/ic/handler-compiler.cc b/src/ic/handler-compiler.cc
index 21a653e7b61e126bb9a477a65a729aa5d29a5422..dd5a067e9fb1f0d189352e4ba63c085fbf110aa5 100644
--- a/src/ic/handler-compiler.cc
+++ b/src/ic/handler-compiler.cc
@@ -228,7 +228,6 @@ Handle<Code> NamedLoadHandlerCompiler::CompileLoadInterceptor(
   bool inline_followup = false;
   switch (it->state()) {
     case LookupIterator::TRANSITION:
-    case LookupIterator::UNKNOWN:
       UNREACHABLE();
     case LookupIterator::ACCESS_CHECK:
     case LookupIterator::INTERCEPTOR:
@@ -276,7 +275,6 @@ void NamedLoadHandlerCompiler::GenerateLoadPostInterceptor(
     case LookupIterator::JSPROXY:
     case LookupIterator::NOT_FOUND:
     case LookupIterator::TRANSITION:
-    case LookupIterator::UNKNOWN:
       UNREACHABLE();
     case LookupIterator::DATA: {
       DCHECK_EQ(FIELD, it->property_details().type());