Ensure we can reliably check the cell for validity of global property

src/ic/arm/handler-compiler-arm.cc

Index: src/ic/arm/handler-compiler-arm.cc
diff --git a/src/ic/arm/handler-compiler-arm.cc b/src/ic/arm/handler-compiler-arm.cc
index 3cf3a44afa0aa2ed71f348722c72e88609553f32..51ba69413624b21e3afde7fe8d2b441706909a37 100644
--- a/src/ic/arm/handler-compiler-arm.cc
+++ b/src/ic/arm/handler-compiler-arm.cc
@@ -498,7 +498,8 @@ Register PropertyHandlerCompiler::CheckPrototypes(
   // Log the check depth.
   LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
 
-  if (depth != 0 || check == CHECK_ALL_MAPS) {
+  if (!current_map->IsJSGlobalObjectMap() &&
+      (depth != 0 || check == CHECK_ALL_MAPS)) {
     // Check the holder map.
     __ ldr(scratch1, FieldMemOperand(reg, HeapObject::kMapOffset));
     Handle<WeakCell> cell = Map::WeakCellForMap(current_map);
@@ -717,7 +718,7 @@ Register NamedStoreHandlerCompiler::value() {
 
 
 Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
-    Handle<PropertyCell> cell, Handle<Name> name, bool is_configurable) {
+    Handle<PropertyCell> cell, Handle<Name> name) {
   Label miss;
   if (IC::ICUseVector(kind())) {
     PushVectorAndSlot();
@@ -730,12 +731,9 @@ Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
   __ LoadWeakValue(result, weak_cell, &miss);
   __ ldr(result, FieldMemOperand(result, Cell::kValueOffset));
 
-  // Check for deleted property if property can actually be deleted.
-  if (is_configurable) {
-    __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
-    __ cmp(result, ip);
-    __ b(eq, &miss);
-  }
+  __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+  __ cmp(result, ip);
+  __ b(eq, &miss);
 
   Counters* counters = isolate()->counters();
   __ IncrementCounter(counters->named_load_global_stub(), 1, r1, r3);