[es2015] Remove the @@hasInstance protector cell.

src/isolate-inl.h

Index: src/isolate-inl.h
diff --git a/src/isolate-inl.h b/src/isolate-inl.h
index fe4f92080db1bad052f6fbafd5a584e1a49e37a2..02993cfa6b6a9bdcde227495a468d6db7def1e57 100644
--- a/src/isolate-inl.h
+++ b/src/isolate-inl.h
@@ -133,11 +133,6 @@ bool Isolate::IsArraySpeciesLookupChainIntact() {
          Smi::cast(species_cell->value())->value() == kProtectorValid;
 }
 
-bool Isolate::IsHasInstanceLookupChainIntact() {
-  PropertyCell* has_instance_cell = heap()->has_instance_protector();
-  return has_instance_cell->value() == Smi::FromInt(kProtectorValid);
-}
-
 bool Isolate::IsStringLengthOverflowIntact() {
   PropertyCell* string_length_cell = heap()->string_length_protector();
   return string_length_cell->value() == Smi::FromInt(kProtectorValid);