Avoid one repeated property lookup when computing load ICs.

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 ddd1bbe4debe102fc82794faae6f3e049b1b0e76..add7b8d8e643c1a978c7c70cecf5e89c12ad2a15 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -1180,7 +1180,7 @@ void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
 
 
 Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
-    Handle<PropertyCell> cell, Handle<Name> name, bool is_dont_delete) {
+    Handle<PropertyCell> cell, Handle<Name> name, bool is_configurable) {
   Label miss;
   FrontendHeader(receiver(), name, &miss);
 
@@ -1190,7 +1190,7 @@ Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
   __ movp(result, FieldOperand(result, PropertyCell::kValueOffset));
 
   // Check for deleted property if property can actually be deleted.
-  if (!is_dont_delete) {
+  if (is_configurable) {
     __ CompareRoot(result, Heap::kTheHoleValueRootIndex);
     __ j(equal, &miss);
   } else if (FLAG_debug_code) {