This reverts commit 2998c8d6b99ec49925ebea42198b29c3e27b34a7. We need to find a better way to fix this bug. Even with this refcount change, errors were still being seen in CI. For now we need to remove this failing test.
cause:
Thread#raise
Fiber#raise
SET_SHAREABLE
set_table->bins
set_table->entries
rb_gc_mark_and_move
rb_gc_location