Previously this was listed as a suppression, but we actually want this
permanently unsanitized. This should be faster and more reliable since
TASN won't have to match against symbolicated backtraces.

This introduces a new method to encapsulate checking whether the current
Ractor owns the vm->ractor.sync lock. This allows us to disable TSan on
it since that operation should be safe, and still get validation of
other uses.

* Add gc_enable/disable to TSAN suppressions
* Remove deleted methods from tsan suppressions
* Remove TSAN errors we've fixed
* Add another two inline cache suppressions
* Improve comments

Now that the shape_id gives us all the same information, it's no
longer needed.