Revert "Improve hashCode for closure objects"

runtime/vm/bootstrap_nocore.cc

Index: runtime/vm/bootstrap_nocore.cc
diff --git a/runtime/vm/bootstrap_nocore.cc b/runtime/vm/bootstrap_nocore.cc
index ba5aff8af032059cfb42b500d5d94b87b4597d82..5dc37b0dbdd06540536a4ef965bdac30022dd1e6 100644
--- a/runtime/vm/bootstrap_nocore.cc
+++ b/runtime/vm/bootstrap_nocore.cc
@@ -49,7 +49,7 @@ void Finish(Thread* thread, bool from_kernel) {
 #if defined(DEBUG)
   // Verify that closure field offsets are identical in Dart and C++.
   const Array& fields = Array::Handle(zone, cls.fields());
-  ASSERT(fields.Length() == 5);
+  ASSERT(fields.Length() == 4);
   Field& field = Field::Handle(zone);
   field ^= fields.At(0);
   ASSERT(field.Offset() == Closure::instantiator_type_arguments_offset());
@@ -59,8 +59,6 @@ void Finish(Thread* thread, bool from_kernel) {
   ASSERT(field.Offset() == Closure::function_offset());
   field ^= fields.At(3);
   ASSERT(field.Offset() == Closure::context_offset());
-  field ^= fields.At(4);
-  ASSERT(field.Offset() == Closure::hash_offset());
 #endif  // defined(DEBUG)
 
   // Eagerly compile Bool class, bool constants are used from within compiler.