Compiler does not warn on unused locals on joined assignments

[ivanbasov]

Code example

class C
{
    int M()
    {
        int a = 0;
        int b = 0;
        a = b = 0;
        return b;
    }
}

Expected Provides a diagnostic that 'a' is unused

Actual No diagnostics

roslyn-analyzers uses compiler warnings as a source of unused locals diagnostics

[jcouv]

Linking to warning waves issue (https://github.com/dotnet/roslyn/issues/1580)