RTS cannot be reinitialized reliably after hs_exit()

#2863 (closed) added the FFI spec violation to the docs, but as far as I can tell, there is and was no ticket to actually fix the problems, which seem to be:

1. If the runtime is deinitialized by an hs_exit() matching the first hs_init(), then it cannot be reinitialized reliably using hs_init().
2. This condition is not detected, and leads to unpredictable behavior.

I'll add a link to this ticket to the user's guide; even if the ticket is ultimately closed as WONTFIX, it will be good to have a persistent reference.

Trac metadata

Trac field	Value
Version	6.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
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