Disable IL verification for nuget version of compiler by default

# Conflicts:
#	src/Markup/Avalonia.Markup.Xaml/XamlIl/xamlil.github

build/BuildTargets.targets

@@ -2,6 +2,7 @@
   <PropertyGroup>
     <AvaloniaBuildTasksLocation>$(MSBuildThisFileDirectory)\..\src\Avalonia.Build.Tasks\bin\$(Configuration)\netstandard2.0\Avalonia.Build.Tasks.dll</AvaloniaBuildTasksLocation>
     <AvaloniaUseExternalMSBuild>true</AvaloniaUseExternalMSBuild>
+    <AvaloniaXamlIlVerifyIl>true</AvaloniaXamlIlVerifyIl>
   </PropertyGroup>
   <Import Project="$(MSBuildThisFileDirectory)\..\packages\Avalonia\AvaloniaBuildTasks.props"/>
   <Import Project="$(MSBuildThisFileDirectory)\..\packages\Avalonia\AvaloniaBuildTasks.targets"/>

packages/Avalonia/AvaloniaBuildTasks.targets

@@ -53,6 +53,7 @@
     <PropertyGroup>
       <AvaloniaXamlReferencesTemporaryFilePath Condition="'$(AvaloniaXamlReferencesTemporaryFilePath)' == ''">$(IntermediateOutputPath)/Avalonia/references</AvaloniaXamlReferencesTemporaryFilePath>
       <AvaloniaXamlOriginalCopyFilePath Condition="'$(AvaloniaXamlOriginalCopyFilePath)' == ''">$(IntermediateOutputPath)/Avalonia/original.dll</AvaloniaXamlOriginalCopyFilePath>
+      <AvaloniaXamlIlVerifyIl Condition="'$(AvaloniaXamlIlVerifyIl)' == ''">false</AvaloniaXamlIlVerifyIl>
     </PropertyGroup>
     <WriteLinesToFile
       Condition="'$(_AvaloniaForceInternalMSBuild)' != 'true'"
@@ -65,6 +66,7 @@
       ReferencesFilePath="$(AvaloniaXamlReferencesTemporaryFilePath)"
       OriginalCopyPath="$(AvaloniaXamlOriginalCopyFilePath)"
       ProjectDirectory="$(MSBuildProjectDirectory)"
+      VerifyIl="$(AvaloniaXamlIlVerifyIl)"
     />
     <Exec
       Condition="'$(_AvaloniaUseExternalMSBuild)' == 'true'"

src/Avalonia.Build.Tasks/CompileAvaloniaXamlTask.cs

@@ -34,7 +34,7 @@ namespace Avalonia.Build.Tasks
 
             var res = XamlCompilerTaskExecutor.Compile(BuildEngine, input,
                 File.ReadAllLines(ReferencesFilePath).Where(l => !string.IsNullOrWhiteSpace(l)).ToArray(),
-                ProjectDirectory, OutputPath);
+                ProjectDirectory, OutputPath, VerifyIl);
             if (!res.Success)
                 return false;
             if (!res.WrittenFile)
@@ -66,6 +66,8 @@ namespace Avalonia.Build.Tasks
         public string ProjectDirectory { get; set; }
         
         public string OutputPath { get; set; }
+
+        public bool VerifyIl { get; set; }
         
         public IBuildEngine BuildEngine { get; set; }
         public ITaskHost HostObject { get; set; }

src/Avalonia.Build.Tasks/Program.cs

@@ -28,7 +28,8 @@ namespace Avalonia.Build.Tasks
                 ReferencesFilePath = args[1],
                 OutputPath = args[2],
                 BuildEngine = new ConsoleBuildEngine(),
-                ProjectDirectory = Directory.GetCurrentDirectory()
+                ProjectDirectory = Directory.GetCurrentDirectory(),
+                VerifyIl = true
             }.Execute() ?
                 0 :
                 2;

src/Avalonia.Build.Tasks/XamlCompilerTaskExecutor.cs

@@ -40,7 +40,7 @@ namespace Avalonia.Build.Tasks
         }
         
         public static CompileResult Compile(IBuildEngine engine, string input, string[] references, string projectDirectory,
-            string output)
+            string output, bool verifyIl)
         {
             var typeSystem = new CecilTypeSystem(references.Concat(new[] {input}), input);
             var asm = typeSystem.TargetAssemblyDefinition;
@@ -65,7 +65,7 @@ namespace Avalonia.Build.Tasks
             var contextClass = XamlIlContextDefinition.GenerateContextClass(typeSystem.CreateTypeBuilder(contextDef), typeSystem,
                 xamlLanguage);
 
-            var compiler = new AvaloniaXamlIlCompiler(compilerConfig, contextClass);
+            var compiler = new AvaloniaXamlIlCompiler(compilerConfig, contextClass) { EnableIlVerification = verifyIl };
 
             var editorBrowsableAttribute = typeSystem
                 .GetTypeReference(typeSystem.FindType("System.ComponentModel.EditorBrowsableAttribute"))

src/Markup/Avalonia.Markup.Xaml/XamlIl/AvaloniaXamlIlRuntimeCompiler.cs

@@ -114,10 +114,10 @@ namespace Avalonia.Markup.Xaml.XamlIl
 
             InitializeSre();
             var asm = localAssembly == null ? null : _sreTypeSystem.GetAssembly(localAssembly);
-            
+
             var compiler = new AvaloniaXamlIlCompiler(new XamlIlTransformerConfiguration(_sreTypeSystem, asm,
-                _sreMappings, _sreXmlns, AvaloniaXamlIlLanguage.CustomValueConverter),
-                _sreContextType);
+                    _sreMappings, _sreXmlns, AvaloniaXamlIlLanguage.CustomValueConverter),
+                _sreContextType) { EnableIlVerification = true };
             var tb = _sreBuilder.DefineType("Builder_" + Guid.NewGuid().ToString("N") + "_" + uri);
 
             IXamlIlType overrideType = null;