Don't place unconstructed EETypes in the types hashtable

[MichalStrehovsky]

We shouldn't need to see the unconstructed types at runtime for anything.

Fixes #1262.

[jkotas]

Thanks. Does the linked issue fail with missing metadata exception now?

[MichalStrehovsky]

Thanks. Does the linked issue fail with missing metadata exception now?

Yup:

Unhandled Exception: System.Reflection.MissingMetadataException: 'System.Func<System.Int32>' is missing metadata. For more information, please visit http://go.microsoft.com/fwlink/?LinkID=392859
   at System.Reflection.Runtime.General.TypeUnifier.WithVerifiedTypeHandle(RuntimeConstructedGenericTypeInfo, RuntimeTypeInfo[]) + 0x19a
   at System.Reflection.Runtime.General.TypeUnifier.GetConstructedGenericTypeWithTypeHandle(RuntimeTypeInfo, RuntimeTypeInfo[]) + 0x3e
   at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.MakeGenericType(Type[]) + 0x4b0
   at System.Linq.Expressions.Compiler.DelegateHelpers.GetFuncType(Type[]) + 0xc8
   at System.Linq.Expressions.Compiler.DelegateHelpers.MakeNewDelegate(Type[]) + 0x1c0
   at System.Linq.Expressions.Compiler.DelegateHelpers.MakeDelegateType(Type[]) + 0xf5
   at System.Linq.Expressions.Expression.Lambda(Expression, String, Boolean, IEnumerable`1) + 0x2cc
   at System.Linq.Expressions.Expression.Lambda(Expression, Boolean, IEnumerable`1) + 0x32
   at System.Linq.Expressions.Expression.Lambda(Expression, ParameterExpression[]) + 0x27
   at LiteDB.LinqExpressionVisitor.Evaluate(Expression, Type[]) + 0x102
   at LiteDB.LinqExpressionVisitor.VisitBinary(BinaryExpression) + 0x3df
   at System.Linq.Expressions.BinaryExpression.Accept(ExpressionVisitor) + 0x33
   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression) + 0x42
   at System.Linq.Expressions.ExpressionVisitor.VisitLambda[T](Expression`1) + 0x6b
   at LiteDB.LinqExpressionVisitor.VisitLambda[T](Expression`1) + 0x45
   at System.Linq.Expressions.Expression`1.Accept(ExpressionVisitor) + 0x7a
   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression) + 0x42
   at LiteDB.LinqExpressionVisitor.Resolve(Boolean) + 0x67
   at LiteDB.BsonMapper.GetExpression[T, K](Expression`1) + 0xa7
   at LiteDB.LiteCollection`1.Exists(Expression`1) + 0x5e
   at ConsoleApp1.Program.Main(String[]) + 0x646
   at reproNative!<BaseAddress>+0x7198d7
   at reproNative!<BaseAddress>+0x719960