[master] Update dependencies from mono/linker (#44322)

* Update dependencies from https://github.com/mono/linker build 20201105.1 Microsoft.NET.ILLink.Tasks From Version 6.0.0-alpha.1.20527.2 -> To Version 6.0.0-alpha.1.20555.1 * Update dependencies from https://github.com/mono/linker build 20201105.2 Microsoft.NET.ILLink.Tasks From Version 6.0.0-alpha.1.20527.2 -> To Version 6.0.0-alpha.1.20555.2 * Disable new optimization for libraries mode (it cannot work in this mode) Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com> Co-authored-by: Marek Safar <marek.safar@gmail.com>

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -186,9 +186,9 @@
  <Uri>https://github.com/dotnet/runtime</Uri>
  <Sha>38017c3935de95d0335bac04f4901ddfc2718656</Sha>
  </Dependency>
- <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.0-alpha.1.20527.2">
+ <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.0-alpha.1.20555.2">
  <Uri>https://github.com/mono/linker</Uri>
- <Sha>57974c1f5790e6fb33f5fce161707be5cd86c4d3</Sha>
+ <Sha>b8e2a581c7e1ebc1b98081aa7a5474521b7351f9</Sha>
  </Dependency>
  <Dependency Name="Microsoft.DotNet.XHarness.TestRunners.Xunit" Version="1.0.0-prerelease.20555.2">
  <Uri>https://github.com/dotnet/xharness</Uri>

eng/Versions.props

@@ -149,7 +149,7 @@
  <!-- Docs -->
  <MicrosoftPrivateIntellisenseVersion>5.0.0-preview-20201009.2</MicrosoftPrivateIntellisenseVersion>
  <!-- ILLink -->
- <MicrosoftNETILLinkTasksVersion>6.0.0-alpha.1.20527.2</MicrosoftNETILLinkTasksVersion>
+ <MicrosoftNETILLinkTasksVersion>6.0.0-alpha.1.20555.2</MicrosoftNETILLinkTasksVersion>
  <!-- ICU -->
  <MicrosoftNETCoreRuntimeICUTransportVersion>6.0.0-alpha.1.20526.1</MicrosoftNETCoreRuntimeICUTransportVersion>
  <!-- Mono LLVM -->

eng/illink.targets

@@ -231,6 +231,8 @@
  <ILLinkArgs>$(ILLinkArgs) --skip-unresolved true</ILLinkArgs>
  <!-- keep interface implementations -->
  <ILLinkArgs>$(ILLinkArgs) --disable-opt unusedinterfaces</ILLinkArgs>
+ <!-- keep any type check -->
+ <ILLinkArgs>$(ILLinkArgs) --disable-opt unusedtypechecks</ILLinkArgs>
  </PropertyGroup>
  </Target>