Fix #4914 (I hope)
Fix #4914 (I hope)

Here's a bit of erroneous code:

00000c5c <s1ad_info>:
     c5c:       8b 45 08                mov    0x8(%ebp),%eax
     c5f:       d9 46 03                flds   0x3(%esi)
     c62:       dd d9                   fstp   %st(1)
     c64:       d9 55 08                fsts   0x8(%ebp)
     c67:       89 c6                   mov    %eax,%esi
     c69:       c7 45 00 24 0c 00 00    movl   $0xc24,0x0(%ebp)
     c70:       f7 c6 03 00 00 00       test   $0x3,%esi
     c76:       75 ac                   jne    c24 <s1ac_info>

So we should be doing some ffrees before the jne.  The code that
inserts the ffrees wasn't expecting to do it for a conditional jump,
because they are usually local, but we have a late optimisation that
shortcuts jumps-to-jumps, and that can result in a non-local
conditional jump.

This at least fixes an instance of the bug that I was able to
reproduce, let's hope there aren't any more.

sgillespie/ghc,gcampax/ghc,nomeata/ghc,ryantm/ghc,nushio3/ghc,ml9951/ghc,da-x/ghc,frantisekfarka/ghc-dsi,christiaanb/ghc,jstolarek/ghc,oldmanmike/ghc,jstolarek/ghc,urbanslug/ghc,urbanslug/ghc,shlevy/ghc,holzensp/ghc,nomeata/ghc,frantisekfarka/ghc-dsi,lukexi/ghc-7.8-arm64,gridaphobe/ghc,urbanslug/ghc,ryantm/ghc,urbanslug/ghc,AlexanderPankiv/ghc,shlevy/ghc,mettekou/ghc,tibbe/ghc,vikraman/ghc,ekmett/ghc,mcschroeder/ghc,forked-upstream-packages-for-ghcjs/ghc,nathyong/microghc-ghc,bitemyapp/ghc,ml9951/ghc,acowley/ghc,lukexi/ghc-7.8-arm64,gcampax/ghc,mettekou/ghc,acowley/ghc,mettekou/ghc,nushio3/ghc,sgillespie/ghc,gcampax/ghc,nathyong/microghc-ghc,hferreiro/replay,AlexanderPankiv/ghc,lukexi/ghc,wxwxwwxxx/ghc,olsner/ghc,sgillespie/ghc,nomeata/ghc,mfine/ghc,spacekitteh/smcghc,acowley/ghc,tjakway/ghcjvm,wxwxwwxxx/ghc,nushio3/ghc,sdiehl/ghc,shlevy/ghc,ekmett/ghc,AlexanderPankiv/ghc,wxwxwwxxx/ghc,green-haskell/ghc,GaloisInc/halvm-ghc,fmthoma/ghc,wxwxwwxxx/ghc,vikraman/ghc,ilyasergey/GHC-XAppFix,tjakway/ghcjvm,mfine/ghc,wxwxwwxxx/ghc,TomMD/ghc,mcschroeder/ghc,green-haskell/ghc,jstolarek/ghc,siddhanathan/ghc,lukexi/ghc,gridaphobe/ghc,hferreiro/replay,sgillespie/ghc,acowley/ghc,forked-upstream-packages-for-ghcjs/ghc,mfine/ghc,ezyang/ghc,christiaanb/ghc,ezyang/ghc,anton-dessiatov/ghc,urbanslug/ghc,ml9951/ghc,GaloisInc/halvm-ghc,fmthoma/ghc,gridaphobe/ghc,lukexi/ghc-7.8-arm64,siddhanathan/ghc,bitemyapp/ghc,tjakway/ghcjvm,shlevy/ghc,vTurbine/ghc,urbanslug/ghc,GaloisInc/halvm-ghc,ezyang/ghc,da-x/ghc,gridaphobe/ghc,hferreiro/replay,mfine/ghc,gcampax/ghc,mcmaniac/ghc,ekmett/ghc,green-haskell/ghc,green-haskell/ghc,fmthoma/ghc,tjakway/ghcjvm,tjakway/ghcjvm,vTurbine/ghc,tjakway/ghcjvm,ml9951/ghc,holzensp/ghc,ml9951/ghc,bitemyapp/ghc,TomMD/ghc,snoyberg/ghc,nathyong/microghc-ghc,nushio3/ghc,forked-upstream-packages-for-ghcjs/ghc,ghc-android/ghc,anton-dessiatov/ghc,ghc-android/ghc,spacekitteh/smcghc,gcampax/ghc,GaloisInc/halvm-ghc,elieux/ghc,mcschroeder/ghc,AlexanderPankiv/ghc,ezyang/ghc,gridaphobe/ghc,shlevy/ghc,fmthoma/ghc,TomMD/ghc,tibbe/ghc,christiaanb/ghc,ghc-android/ghc,christiaanb/ghc,ilyasergey/GHC-XAppFix,fmthoma/ghc,GaloisInc/halvm-ghc,oldmanmike/ghc,mcschroeder/ghc,oldmanmike/ghc,holzensp/ghc,anton-dessiatov/ghc,nkaretnikov/ghc,ghc-android/ghc,gcampax/ghc,anton-dessiatov/ghc,vikraman/ghc,hferreiro/replay,sdiehl/ghc,elieux/ghc,snoyberg/ghc,nushio3/ghc,nkaretnikov/ghc,holzensp/ghc,anton-dessiatov/ghc,ml9951/ghc,acowley/ghc,christiaanb/ghc,nomeata/ghc,mettekou/ghc,hferreiro/replay,nathyong/microghc-ghc,elieux/ghc,nushio3/ghc,sdiehl/ghc,green-haskell/ghc,urbanslug/ghc,forked-upstream-packages-for-ghcjs/ghc,mfine/ghc,nathyong/microghc-ghc,vTurbine/ghc,AlexanderPankiv/ghc,spacekitteh/smcghc,da-x/ghc,AlexanderPankiv/ghc,oldmanmike/ghc,GaloisInc/halvm-ghc,mcmaniac/ghc,TomMD/ghc,ml9951/ghc,christiaanb/ghc,mfine/ghc,siddhanathan/ghc,olsner/ghc,ml9951/ghc,mettekou/ghc,vTurbine/ghc,mettekou/ghc,lukexi/ghc-7.8-arm64,fmthoma/ghc,nushio3/ghc,acowley/ghc,ryantm/ghc,tibbe/ghc,elieux/ghc,jstolarek/ghc,TomMD/ghc,jstolarek/ghc,sdiehl/ghc,GaloisInc/halvm-ghc,nomeata/ghc,elieux/ghc,holzensp/ghc,sgillespie/ghc,mcschroeder/ghc,olsner/ghc,da-x/ghc,TomMD/ghc,oldmanmike/ghc,forked-upstream-packages-for-ghcjs/ghc,siddhanathan/ghc,ryantm/ghc,frantisekfarka/ghc-dsi,olsner/ghc,siddhanathan/ghc,lukexi/ghc,nkaretnikov/ghc,mcmaniac/ghc,vTurbine/ghc,snoyberg/ghc,tibbe/ghc,vikraman/ghc,bitemyapp/ghc,AlexanderPankiv/ghc,frantisekfarka/ghc-dsi,sdiehl/ghc,oldmanmike/ghc,bitemyapp/ghc,mcschroeder/ghc,ezyang/ghc,hferreiro/replay,vTurbine/ghc,sdiehl/ghc,tjakway/ghcjvm,snoyberg/ghc,mcmaniac/ghc,ghc-android/ghc,ilyasergey/GHC-XAppFix,sdiehl/ghc,mcmaniac/ghc,vikraman/ghc,gridaphobe/ghc,vikraman/ghc,wxwxwwxxx/ghc,forked-upstream-packages-for-ghcjs/ghc,lukexi/ghc-7.8-arm64,ghc-android/ghc,lukexi/ghc,tibbe/ghc,olsner/ghc,ekmett/ghc,mettekou/ghc,christiaanb/ghc,ezyang/ghc,siddhanathan/ghc,spacekitteh/smcghc,spacekitteh/smcghc,forked-upstream-packages-for-ghcjs/ghc,olsner/ghc,nkaretnikov/ghc,anton-dessiatov/ghc,siddhanathan/ghc,vTurbine/ghc,TomMD/ghc,shlevy/ghc,sgillespie/ghc,lukexi/ghc,da-x/ghc,ghc-android/ghc,nkaretnikov/ghc,vikraman/ghc,oldmanmike/ghc,frantisekfarka/ghc-dsi,gcampax/ghc,snoyberg/ghc,shlevy/ghc,nathyong/microghc-ghc,acowley/ghc,mcschroeder/ghc,nkaretnikov/ghc,ryantm/ghc,fmthoma/ghc,da-x/ghc,ezyang/ghc,elieux/ghc,ekmett/ghc,da-x/ghc,elieux/ghc,hferreiro/replay,snoyberg/ghc,sgillespie/ghc,ilyasergey/GHC-XAppFix,olsner/ghc,nathyong/microghc-ghc,gridaphobe/ghc,nkaretnikov/ghc,snoyberg/ghc,wxwxwwxxx/ghc,mfine/ghc,anton-dessiatov/ghc