Pass DSA_ALLOC_HUGE when allocating a shared TIDBitmap.
When creating an unshared TIDBitmap, we pass MCXT_ALLOC_HUGE to allow
allocations >1GB, so by analogy we pass DSA_ALLOC_HUGE for a shared
TIDBitmap.
Bug introduced by commit
98e6e89040a0534ca26914c66cae9dd49ef62ad9.
Report by Rafia Sabih, fix by Dilip Kumar, adjusted by me.
Discussion: http://postgr.es/m/CAOGQiiPpSnkuKq+oUK_bvQFg2EPGFPN8RwgxTgBa6HU_kQa3EA@mail.gmail.com