[master] Update dependencies from mono/linker

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/mono/linker

• Subscription: 9ac01057-d33d-4509-c9e1-08d846b6e5b9
• Build: 20201215.1
• Date Produced: 12/15/2020 9:44 AM
• Commit: a074fbfd1d0d639893bd61afc7e946a275af9e55
• Branch: refs/heads/master

• Updates:
  • Microsoft.NET.ILLink.Tasks: from 6.0.0-alpha.1.20608.3 to 6.0.0-alpha.1.20615.1

[marek-safar]

@sbomer this PR is blocked because of the XML descriptor breaking change. The failing test is Microsoft.NET.Publish.Tests.GivenThatWeWantToRunILLink.ILLink_respects_feature_settings_from_host_config. Maybe we should change the warning to be an error.

resource ILLink.Substitutions.xml in HelloWorld, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null : warning IL2101: Embedded XML in assembly 'HelloWorld' contains assembly "fullname" attribute for another assembly 'ClassLibForILLink, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' [C:\h\w\B6C709AD\t\dotnetSdkTests\zfbva2hp.w0h\ILLink_respec---D9B75401\HelloWorld\HelloWorld.csproj]

Then there is second problem which looks like is caused by the automatic removal of default ctors for serializable types.

Fatal error. Internal CLR error. (0x80131506)
   at System.RuntimeTypeHandle.CreateInstanceForAnotherGenericParameter(System.RuntimeType, System.RuntimeType)
   at System.Collections.Generic.ComparerHelpers.CreateDefaultEqualityComparer(System.Type)
   at System.Collections.Generic.EqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]..cctor()
   at System.Collections.Generic.EqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Default()
   at System.Collections.Generic.NonRandomizedStringEqualityComparer..cctor()
   at System.Collections.Generic.Dictionary`2[[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]..ctor(Int32, System.Collections.Generic.IEqualityComparer`1<System.__Canon>)
   at System.AppContext.Setup(Char**, Char**, Int32)

@vitek-karas This shows up in runtime update as well dotnet/runtime#45926 and it looks like we are missing annotations somewhere.

[marek-safar]

Fixed the second problem by reverting the change