[GHC] #15548: Make TABLES_NEXT_TO_CODE a dynflag

[GHC]

#15548: Make TABLES_NEXT_TO_CODE a dynflag
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           Reporter:  nomeata        |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.5
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The GHC API is used by programs that do not necessarily want to compile
 the same way as the normal GHC, so we want as much configuration in
 `DynFlags` and as little as possible hard-coded.

 One such hard-coded flag is `TABLES_NEXT_TO_CODE`. It is currently used in
 these places:

  * It is (of course) used a lot in rts. That’s fine.
  * It is used via tablesNextToCode :: DynFlags -> Bool in the Cmm code, so
 that code is already prepared to read the information from `DynFlags`.
  * There is `ghciTablesNextToCode :: Bool` in the GHCi code, some
 refactoring there might be needed to add a `DynFlag` there.

 (The motivation is similar to #13477)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15548>
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