Question about Static Readonly Field optimization in Tier 2 JIT ASM

True
True
False
False

; StaticReadonlyField.Program.Test()
       mov       eax,1
       ret
; Total bytes of code 6

[DisassemblyDiagnoser]
public class Program
{
    static readonly bool Is64Bit = Environment.Is64BitProcess;


    static void Main(string[] args)
    {
        BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);

        Console.WriteLine("Done");
        Console.ReadLine();

        Console.WriteLine(Is64Bit);
        Console.WriteLine(new Program().Test());

        unsafe
        {
            fixed(bool* ptr = &Is64Bit)
            {
                *ptr = !Is64Bit;
            }
        }

        Console.WriteLine(Is64Bit);
        Console.WriteLine(new Program().Test());
    }

    [Benchmark]
    public bool Test() => Is64Bit;
}