[GHC] #13604: regression in ghc 8.2.1-rc1 (8.2.0.2017040)

[GHC]

#13604: regression in ghc 8.2.1-rc1 (8.2.0.2017040)
-------------------------------------+-------------------------------------
           Reporter:  George         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  GHCi           |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Runtime
  Unknown/Multiple                   |  performance bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 In 8.2.1-rc1 loading a file compiled with -O2 into ghci results in ghci
 recompiling the file into interpreted byte code. In 8.0.2 it simply loads
 the compiled object file.

 8.2.1
 {{{
  ghc -dynamic -O2 eh2.hs
 [1 of 1] Compiling Main             ( eh2.hs, eh2.o )
 Linking eh2 ...
 bash-3.2$ ghci -ignore-dot-ghci
 GHCi, version 8.2.0.20170404: http://www.haskell.org/ghc/  :? for help
 Prelude> :load eh2
 [1 of 1] Compiling Main             ( eh2.hs, interpreted ) [flags
 changed]
 Ok, modules loaded: Main.
 }}}

 8.0.2

 {{{
  ghc --version
 The Glorious Glasgow Haskell Compilation System, version 8.0.2
 bash-3.2$ pwd
 /Users/gcolpitts/haskell
 bash-3.2$ ghc -dynamic -O2 eh2.hs
 [1 of 1] Compiling Main             ( eh2.hs, eh2.o )
 Linking eh2 ...
 bash-3.2$ ghci -ignore-dot-ghci
 GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
 Prelude> :load eh2
 Ok, modules loaded: Main (eh2.o).
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13604>
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