Cleaning up usage of lookup results.

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index a6acd9791e499dc942d798e4c0d18f5b7298f575..4040e958658b4e4f959b9284f41de94105c267da 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -1143,7 +1143,7 @@ void StubCompiler::GenerateLoadInterceptor(Handle<JSObject> object,
   // later.
   bool compile_followup_inline = false;
   if (lookup->IsFound() && lookup->IsCacheable()) {
-    if (lookup->type() == FIELD) {
+    if (lookup->IsField()) {
       compile_followup_inline = true;
     } else if (lookup->type() == CALLBACKS &&
                lookup->GetCallbackObject()->IsAccessorInfo()) {
@@ -1221,7 +1221,7 @@ void StubCompiler::GenerateLoadInterceptor(Handle<JSObject> object,
                                    miss);
     }
 
-    if (lookup->type() == FIELD) {
+    if (lookup->IsField()) {
       // We found FIELD property in prototype chain of interceptor's holder.
       // Retrieve a field from field's holder.
       GenerateFastPropertyLoad(masm(), rax, holder_reg,