Part of the problem with shared is that it is completely inverse of what
it should be.
It fundamentally does not annotate memory with anything extra that is
useful.
At the CPU level there are no guarantees that memory is mapped only to
one thread, nor at the language level.
Therefore all memory is shared between threads.
As long as people have this inverted mindset in place and instead of
wanting to prove its thread owned shared is going to be a problem for us.
Remove shared, add atomic storage class. Figure out thread owned/shared
memory some other day.
