update the arm64 patch for 7.8.4

ghc-arm64.patch

@@ -91,13 +91,13 @@ Index: ghc-7.8.3/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs
                  ArchPPC_64    -> panic "maxSpillSlots ArchPPC_64"
                  ArchAlpha     -> panic "maxSpillSlots ArchAlpha"
                  ArchMipseb    -> panic "maxSpillSlots ArchMipseb"
-Index: ghc-7.8.3/compiler/nativeGen/RegAlloc/Linear/Main.hs
+Index: ghc-7.8.4/compiler/nativeGen/RegAlloc/Linear/Main.hs
 ===================================================================
---- ghc-7.8.3.orig/compiler/nativeGen/RegAlloc/Linear/Main.hs	2014-07-10 10:16:42.533187516 +0200
-+++ ghc-7.8.3/compiler/nativeGen/RegAlloc/Linear/Main.hs	2014-07-10 10:16:42.529187516 +0200
+--- ghc-7.8.4/compiler/nativeGen/RegAlloc/Linear/Main.hs.orig	2015-02-07 18:19:27.364827776 +0100
++++ ghc-7.8.4/compiler/nativeGen/RegAlloc/Linear/Main.hs	2015-02-07 18:20:46.813771354 +0100
 @@ -207,6 +207,7 @@
-       ArchSPARC     -> linearRegAlloc' dflags (frInitFreeRegs platform :: SPARC.FreeRegs)  first_id block_live sccs
-       ArchPPC       -> linearRegAlloc' dflags (frInitFreeRegs platform :: PPC.FreeRegs)    first_id block_live sccs
+       ArchSPARC     -> linearRegAlloc' dflags (frInitFreeRegs platform :: SPARC.FreeRegs)  entry_ids block_live sccs
+       ArchPPC       -> linearRegAlloc' dflags (frInitFreeRegs platform :: PPC.FreeRegs)    entry_ids block_live sccs
        ArchARM _ _ _ -> panic "linearRegAlloc ArchARM"
 +      ArchARM64     -> panic "linearRegAlloc ArchARM64"
        ArchPPC_64    -> panic "linearRegAlloc ArchPPC_64"

ghc.spec

@@ -540,6 +540,7 @@ fi
 * Sat Feb  7 2015 Jens Petersen <petersen@redhat.com> - 7.8.4-39.1
 - version doc htmldirs again
 - all archs have bindir/ghci
+- update the arm64 patch for 7.8.4
 
 * Sat Jan 17 2015 Jens Petersen <petersen@redhat.com> - 7.8.4-39
 - update to 7.8.4