-O0 -g slows GHC down on list literals (compared to -O0 without -g)

Tried to buld syb-0.6 testsuite with '-O0 -g' flags today and noticed compiler hung for a couple of hours.

Distilled example from syb-0.6 testsuite (exact example attached):

{-# LANGUAGE NoImplicitPrelude #-}
{-# OPTIONS_GHC -O0 #-}
module Bug (bug) where

{-# NOINLINE f #-}
f :: a -> a
f v = v

bug :: [()]
bug = f v

v :: [()]
v =
       [(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),()
,(),(),(),(),() ... --- a lot of these
       ]

$ time ghc -c -fforce-recomp -O0 Bug.hs 

real    0m0.333s
user    0m0.288s
sys     0m0.042s

$ time ghc -c -fforce-recomp -O0 -g Bug.hs 

real    0m40.241s
user    0m40.021s
sys     0m0.070s

For some reason -g manages slow things down at a large factor.

Trac metadata

Trac field	Value
Version	7.10.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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