Marshal.PtrToStringAnsi replacement

Functions that return pointers to strings, such as GL.GetString, use wrappers that convert the returned pointer to managed strings, i.e:

[DllImport("opengl32")]
static extern IntPtr glGetString(StringName name);
 
public static string GetString(StringName name)
{
    return Marshal.PtrToStringAnsi(glGetString(name));
}

This wrapper can be written as follows for a 5x-10x speed increase:

public static string GetString(StringName name)
{
    unsafe { return new string((sbyte*)glGetString(name)); }
}

We have to investigate if this works regardless of the current culture. If so the generator should be modified to use the second wrapper instead of the first.