Added EF6 performance tests back in netcoreapp3.0 (#1361)

* Added EF6 tests in netcoreapp3.0

* Fix up EF Core ref to always be 6.3.0
Co-authored-by: Alex Bagnolini <alex.bagnolini@ericsoft.com>
Co-authored-by: Nick Craver <craver@stackoverflow.com>

Dapper.Tests.Performance/Benchmarks.EntityFramework.cs

-#if NET4X
-using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Attributes;
 using System.ComponentModel;
 using System.Linq;
 
@@ -39,4 +38,3 @@ public Post NoTracking()
         }
     }
 }
-#endif

Dapper.Tests.Performance/Dapper.Tests.Performance.csproj

@@ -15,6 +15,7 @@
     <PackageReference Include="BenchmarkDotNet" Version="0.11.5" />
     <PackageReference Include="DevExpress.Xpo" Version="19.1.5" />
     <!--<PackageReference Include="BLToolkit" Version="4.3.6" />-->
+    <PackageReference Include="EntityFramework" Version="6.3.0" />
     <PackageReference Include="FirebirdSql.Data.FirebirdClient" Version="7.0.0" />
     <PackageReference Include="linq2db.SqlServer" Version="2.9.0" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.2.6" />
@@ -37,7 +38,6 @@
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net462'">
     <ProjectReference Include="..\Dapper.EntityFramework\Dapper.EntityFramework.csproj" />
-    <PackageReference Include="EntityFramework" Version="6.2.0" />
     <PackageReference Include="Microsoft.SqlServer.Types" Version="14.0.1016.290" />
     <PackageReference Include="Soma" Version="1.9.0.1" />
     <PackageReference Include="SubSonic" Version="3.0.0.4" />

Dapper.Tests.Performance/EntityFramework/EFContext.cs

-#if NET4X
-using System.Data.Common;
+using System.Data.Common;
 using System.Data.Entity;
 
 namespace Dapper.Tests.Performance.EntityFramework
@@ -13,4 +12,3 @@ public EFContext(DbConnection connection, bool owned = false) : base(connection,
         public DbSet<Post> Posts { get; set; }
     }
 }
-#endif

Dapper.Tests.Performance/LegacyTests.cs

@@ -8,6 +8,7 @@
 using Belgrade.SqlClient;
 using Dapper.Contrib.Extensions;
 using Dapper.Tests.Performance.Dashing;
+using Dapper.Tests.Performance.EntityFramework;
 using Dapper.Tests.Performance.EntityFrameworkCore;
 using Dapper.Tests.Performance.NHibernate;
 using Dashing;
@@ -22,7 +23,6 @@
 using System.Threading.Tasks;
 #if NET4X
 using System.Data.Linq;
-using Dapper.Tests.Performance.EntityFramework;
 using Dapper.Tests.Performance.Linq2Sql;
 using Dapper.Tests.Performance.Xpo;
 using NHibernate.Linq;
@@ -343,7 +343,6 @@ public async Task RunAsync(int iterations)
                     }, "DevExpress.XPO: FindObject<T>");
                 }, "DevExpress.XPO");
 
-#if NET4X
                 // Entity Framework
                 Try(() =>
                 {
@@ -357,6 +356,7 @@ public async Task RunAsync(int iterations)
                     tests.Add(id => entityContext3.Posts.AsNoTracking().First(p => p.Id == id), "Entity Framework: No Tracking");
                 }, "Entity Framework");
 
+#if NET4X
                 // Linq2SQL
                 Try(() =>
                 {