Exclude const-strings from global constant tracking.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 089870068f81aaeac6e727f0b99625692bca7085..2ecc57b5de96c83ab19bce37a8bdf012a94f7c91 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -15918,7 +15918,7 @@ Type* PropertyCell::UpdateType(Handle<PropertyCell> cell,
                                Handle<Object> value) {
   Isolate* isolate = cell->GetIsolate();
   Handle<Type> old_type(cell->type(), isolate);
-  Handle<Type> new_type(value->IsTheHole()
+  Handle<Type> new_type(value->IsConsString() || value->IsTheHole()
                         ? Type::Any()
                         : Type::Constant(value, isolate), isolate);