GetHashCode is not working correctly for class objects

[josesimoes]

Library/API/IoT binding

interpreter

Visual Studio version

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.NET nanoFramework extension version

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Description

When calling GetHashCode for the same class object, depending on the call, it produces different hashes.
This was found incidentally when running tests around nanoframework/System.Collections#123.

Code to reproduce this:

public static void Hashtable_ClassAsKey()
{
        SomeKey key = new SomeKey(i);

        var value = key.GetHashCode();

        Debug.WriteLine($"{(int)key.GetHashCode()} vs {value}");
}

public class SomeKey
{
    private readonly int _value;
    public SomeKey() { }

    public SomeKey(int value)
    {
        _value = value;
    }
    public int GetValue => _value;
}

Output from above is for example: 586458527 vs 1002131715 which is wrong.

How to reproduce

Code to reproduce this:

public static void Hashtable_ClassAsKey()
{
        SomeKey key = new SomeKey(i);

        var value = key.GetHashCode();

        Debug.WriteLine($"{(int)key.GetHashCode()} vs {value}");
}

public class SomeKey
{
    private readonly int _value;
    public SomeKey() { }

    public SomeKey(int value)
    {
        _value = value;
    }
    public int GetValue => _value;
}

Output from above is for example: 586458527 vs 1002131715 which is wrong.

Expected behaviour

Calling GetHashCode for the same class object has to return the same hash value.

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Sample project or code

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