JIT: Bad codegen with `AdvSimd.ShiftLeftLogicalWideningLower`

[jakobbotsch]

// Generated by Fuzzlyn v2.4 on 2024-08-26 23:38:13
// Run on Arm64 Linux
// Seed: 8716802894387291290-vectort,vector64,vector128,armadvsimd,armadvsimdarm64,armaes,armarmbase,armarmbasearm64,armcrc32,armcrc32arm64,armdp,armrdm,armrdmarm64,armsha1,armsha256
// Reduced from 19.5 KiB to 0.5 KiB in 00:00:27
// Debug: Outputs <0, 0, 0, 0>
// Release: Outputs <0, 0, 4457472, 0>
using System;
using System.Numerics;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.Arm;

public class C0
{
    public ushort F2;
    public ushort F8;
}

public class Program
{
    public static C0 s_8 = new C0();
    public static void Main()
    {
        var vr6 = s_8.F8;
        var vr7 = s_8.F2;
        var vr8 = Vector64.Create(vr6, vr7, 0, 0);
        Vector128<uint> vr9 = AdvSimd.ShiftLeftLogicalWideningLower(vr8, 0);
        System.Console.WriteLine(vr9);
    }
}

cc @dotnet/jit-contrib

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