Add new RTS options introduced by eras profiling to GHC.RTS.Flags

[mpickering]

GHC MR: https://gitlab.haskell.org/ghc/ghc/-/merge_requests/11917

In GHC MR !11903 several new RTS flags were added to the compiler.

• -he profiling mode
• -he profiling selector
• --automatic-era-increment

Therefore we should also modify GHC.RTS.Flags in the same manner so that users can query whether this option is set from their programs, and keep GHC.RTS.Flags up to date with the implemented RTS flags.

[tomjaguarpaw]

For reference, this is similar to: #243

[Bodigrim]

Since this is very similar to #243 which we've just approved, I don't see much point to wait with a vote. If anything, we definitely want #243 and this land in the same release to bundle changes.

Dear CLC members, let's vote on the proposal to extend GHC.RTS.Flags to reflect recently added RTS flags for era profiling. The MR is available at https://gitlab.haskell.org/ghc/ghc/-/merge_requests/11917 and boils down to extending data DoHeapProfile with a new constructor HeapByEra and extending data ProfFlags with two more fields: automaticEraIncrement :: Bool and eraSelector :: Word.

@tomjaguarpaw @mixphix @hasufell @velveteer @angerman @parsonsmatt

---

+1 from me.

[angerman]

+1

[velveteer]

Definitely +1

[mixphix]

+1

[tomjaguarpaw]

+1

[Bodigrim]

Thanks all, that's enough votes to approve.