Use a Hash Map for Info Table Provenance Entries (IPEs)
Previously, Info Table Provenance Entries (IPEs) were looked up from a single linked list.
Fixes TODO: https://gitlab.haskell.org/ghc/ghc/-/blob/32367cac4e586fb5aedaa021b257388392d976c4/rts/IPE.c#L69
Edited by Sven Tennie