Handle IC Store slow on GlobalObjects

The new Smi handler created to handle StoreIC_Slow and
KeyedStoreIC_Slow can get incorrectly assigned to global Objects.
Added an extra Check to avoid that.

Bug: chromium:1002628
Change-Id: I370e617e791792c98fa7b0cbf89ee7458f4e4c68
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1803659Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Suraj Sharma <surshar@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#63813}

src/ic/ic.cc

@@ -1498,7 +1498,9 @@ void StoreIC::UpdateCaches(LookupIterator* lookup, Handle<Object> value,
   } else {
     set_slow_stub_reason("LookupForWrite said 'false'");
     // TODO(marja): change slow_stub to return MaybeObjectHandle.
-    handler = MaybeObjectHandle(StoreHandler::StoreSlow(isolate()));
+    handler = IsStoreGlobalIC()
+                  ? MaybeObjectHandle(slow_stub())
+                  : MaybeObjectHandle(StoreHandler::StoreSlow(isolate()));
   }
 
   PatchCache(lookup->name(), handler);
@@ -1567,7 +1569,11 @@ MaybeObjectHandle StoreIC::ComputeHandler(LookupIterator* lookup) {
       if (!holder->HasFastProperties()) {
         set_slow_stub_reason("accessor on slow map");
         TRACE_HANDLER_STATS(isolate(), StoreIC_SlowStub);
-        return MaybeObjectHandle(slow_stub());
+        MaybeObjectHandle handler =
+            IsStoreGlobalIC()
+                ? MaybeObjectHandle(slow_stub())
+                : MaybeObjectHandle(StoreHandler::StoreSlow(isolate()));
+        return handler;
       }
       Handle<Object> accessors = lookup->GetAccessors();
       if (accessors->IsAccessorInfo()) {