CA1801 ignores uses in pointer expressions

[cston]

unsafe class C
{
    static int F(byte* b, int x, int y)
    {
        return b[x] + y;
    }
}

c.cs(3,24): warning CA1801: Parameter b of method F is never used. Remove the parameter or use it in the method body.
c.cs(3,31): warning CA1801: Parameter x of method F is never used. Remove the parameter or use it in the method body.

[mavasani]

This case is unknown but very likely IOperation bug, I'll add this case to that bug.

[mavasani]

Added comment to the underlying IOperation bug: dotnet/roslyn#8884 (comment)