[netcoreapp2.0] `AssemblyLoadContext.GetLoadContext` crashes when pass in a dynamic assembly

[daxian-dbw]

AssemblyLoadContext.GetLoadContext crashes the running program when a dynamic assembly is passed in as an argument.

Repro

using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.Loader;

namespace Sample
{
    class Program
    {
        static void Main(string[] args)
        {
            AssemblyName aName = new AssemblyName("Microsoft.PowerShell.Cmdletization.GeneratedTypes");
            AssemblyBuilder ab = AssemblyBuilder.DefineDynamicAssembly(aName, AssemblyBuilderAccess.Run);
            ModuleBuilder mb = ab.DefineDynamicModule(aName.Name);

            string fullEnumName = "Microsoft.PowerShell.Cmdletization.GeneratedTypes.TestEnum";
            Type underlyingType = typeof(Int32);
            EnumBuilder eb = mb.DefineEnum(fullEnumName, TypeAttributes.Public, underlyingType);

            eb.DefineLiteral("Single", 0);
            eb.DefineLiteral("Multiple", 1);

            TypeInfo ti = eb.CreateTypeInfo();

            Console.WriteLine("Dynamic assembly emitted: {0}", ti.Assembly.FullName);

            var loadContext = AssemblyLoadContext.GetLoadContext(ti.Assembly);
            Console.WriteLine("Yay"); // <---- program crashes and this line never executes
        }
    }
}

Expected behavior
The default load context should be returned by AssemblyLoadContext.GetLoadContext

Actual behavior

d:\cmdlet\Sample>dotnet run
Dynamic assembly emitted: Microsoft.PowerShell.Cmdletization.GeneratedTypes, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null

d:\cmdlet\Sample>

I think this bug is related to #21340

/cc @gkhanna79

[gkhanna79]

Issue moved to dotnet/coreclr dotnet/runtime#18350 via ZenHub