Also remove "    " null data for Tag.  Just use zeroes.

Most unused.

Misc. table loading now properly automated.

Faster / more compact code.

Just blacklist based on table sizes like we do for other fonts.

This reverts commit 0c1b287b.

lwsync() is a full read/write-barrier.  That's all we need, never
need sync().  I'm not sure why an isync() was used in fetch_and_add,
but since that's a read-modify-write, I just changed it to have
lwsync() on both sides.

Since add_int and cas are both read-modify-write, I wonder if we
also need a barrier after them.