Il2CppEagerStaticClassConstructionAttribute.cs

using System;

namespace Unity.IL2CPP.CompilerServices
{
    // Modelled after: https://github.com/dotnet/corert/blob/master/src/Runtime.Base/src/System/Runtime/CompilerServices/EagerStaticClassConstructionAttribute.cs
    //
    // When applied to a type this custom attribute will cause any static class constructor to be run eagerly
    // at module load time rather than deferred till just before the class is used.
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, Inherited = false, AllowMultiple = false)]
    public class Il2CppEagerStaticClassConstructionAttribute : Attribute
    {
    }
}