Be a bit more conservative with -O flags, and GC. Hope to avoid runtime GC bug

Operations.hs

@@ -22,7 +22,7 @@ import Data.List            (genericIndex, intersectBy)
 import Data.Bits            ((.|.))
 import qualified Data.Map as M
 
-import System.Mem (performGC)
+-- import System.Mem (performGC)
 import Control.Monad.State
 import Control.Monad.Reader
 import Control.Arrow
@@ -140,7 +140,7 @@ refresh = do
 
     setTopFocus
     clearEnterEvents
-    io performGC -- really helps 
+--  io performGC -- really helps 
 
 -- | clearEnterEvents.  Remove all window entry events from the event queue.
 clearEnterEvents :: X ()

xmonad.cabal

@@ -24,6 +24,6 @@ extra-source-files: README TODO tests/loc.hs tests/Properties.hs man/xmonad.1
 executable:         xmonad
 main-is:            Main.hs
 other-modules:      Config Operations StackSet XMonad
-ghc-options:        -funbox-strict-fields -O2 -fasm -Wall -optl-Wl,-s
+ghc-options:        -funbox-strict-fields -O -fasm -Wall -optl-Wl,-s
 ghc-prof-options:   -prof -auto-all
 extensions:         GeneralizedNewtypeDeriving