JIT: Bad result on arm32

[jakobbotsch]

// Generated by Fuzzlyn v2.4 on 2025-03-09 16:36:14
// Run on Arm Linux
// Seed: 13540383471703664398
// Reduced from 54.8 KiB to 0.6 KiB in 00:00:43
// Debug: Outputs 0
// Release: Outputs 1
using System;

public struct S0
{
    public short F0;
    public sbyte F2;
}

public class Program
{
    public static IRuntime s_rt;
    public static void Main()
    {
        s_rt = new Runtime();
        var vr1 = new S0();
        M6(vr1, 1);
    }

    public static void M6(S0 arg0, short arg1)
    {
        arg1 = arg0.F0;
        s_rt.WriteLine(arg1);
    }
}

public interface IRuntime
{
    void WriteLine<T>(T value);
}

public class Runtime : IRuntime
{
    public void WriteLine<T>(T value) => System.Console.WriteLine(value);
}

cc @dotnet/jit-contrib

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[jakobbotsch]

Looks introduced by #110819