rts/nonmoving: Add missing STM write barrier
When updating a TRec for a TVar already part of a transaction we previously neglected to add the old value to the update remembered set. I suspect this was the cause of #18587 (closed).
Due to a large amount of spam we do not allow new users to create repositories, they are "external" users. If you are a new user and want to create a repository, for example for forking GHC, open a new issue on ghc/ghc using the "get-verified" issue template
When updating a TRec for a TVar already part of a transaction we previously neglected to add the old value to the update remembered set. I suspect this was the cause of #18587 (closed).