public InstanceVariableDeclaration(NameBindingScope scope, ESSymbol name) : base(scope, name)
{
var namedSlotsObject = Expression.Convert(Scope.SelfParameter, TypeGuru.esNamedSlotsObjectType);
namedSlots = Expression.Field(namedSlotsObject, "namedSlots");
var statusFlags = Expression.Field(namedSlotsObject, "statusFlags");
isMutable = Expression.Equal(Expression.And(statusFlags, mutabilityFlagBitConstant), zeroConstant);
}