Proper fix for the issue exposed by r17459

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 579ede542d34cc4e0c7354a110a288025438a726..28e2a89627f4bc82519f1756d14836a8e4156605 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -774,12 +774,12 @@ void StoreStubCompiler::GenerateRestoreName(MacroAssembler* masm,
 
 
 void StubCompiler::GenerateCheckPropertyCell(MacroAssembler* masm,
-                                             Handle<GlobalObject> global,
+                                             Handle<JSGlobalObject> global,
                                              Handle<Name> name,
                                              Register scratch,
                                              Label* miss) {
   Handle<PropertyCell> cell =
-      GlobalObject::EnsurePropertyCell(global, name);
+      JSGlobalObject::EnsurePropertyCell(global, name);
   ASSERT(cell->value()->IsTheHole());
   __ Move(scratch, cell);
   __ Cmp(FieldOperand(scratch, Cell::kValueOffset),
@@ -796,7 +796,7 @@ void StoreStubCompiler::GenerateNegativeHolderLookup(
     Label* miss) {
   if (holder->IsJSGlobalObject()) {
     GenerateCheckPropertyCell(
-        masm, Handle<GlobalObject>::cast(holder), name, scratch1(), miss);
+        masm, Handle<JSGlobalObject>::cast(holder), name, scratch1(), miss);
   } else if (!holder->HasFastProperties() && !holder->IsJSGlobalProxy()) {
     GenerateDictionaryNegativeLookup(
         masm, miss, holder_reg, name, scratch1(), scratch2());
@@ -1055,9 +1055,9 @@ void StubCompiler::GenerateCheckPropertyCells(MacroAssembler* masm,
                                               Label* miss) {
   Handle<JSObject> current = object;
   while (!current.is_identical_to(holder)) {
-    if (current->IsGlobalObject()) {
+    if (current->IsJSGlobalObject()) {
       GenerateCheckPropertyCell(masm,
-                                Handle<GlobalObject>::cast(current),
+                                Handle<JSGlobalObject>::cast(current),
                                 name,
                                 scratch,
                                 miss);
@@ -2928,7 +2928,7 @@ Handle<Code> LoadStubCompiler::CompileLoadNonexistent(
     Handle<JSObject> object,
     Handle<JSObject> last,
     Handle<Name> name,
-    Handle<GlobalObject> global) {
+    Handle<JSGlobalObject> global) {
   Label success;
 
   NonexistentHandlerFrontend(object, last, name, &success, global);