Perform R2R (again) when assemblies have no IL.

[tmds]

In dotnet/aspnetcore#60174 (comment) we found out R2R no longer happens on assemblies that have no IL due to the workaround added in dotnet/sdk#3099.

The workaround can probably be removed and then behavior will be consistent with earlier .NET versions.

cc @dotnet/crossgen-contrib @omajid