make all accesses to ref_count explicitly atomic

It wasn't like this before out of sheer laziness. I think clang failed
the static_assert that made sure it worked, but that might have only
been when it was generating code for the wrong platform. Regardless,
this is still a good idea.
1 file changed
tree: 4585d81f1e8118ddf0dde10ed0250e09bf4b965b
  1. aos/
  2. bbb_cape/
  3. doc/
  4. frc971/
  5. output/
  6. vision/
  7. .gitignore