Use -fproc-alignment=64 unconditionally

Author: sjakobi

unordered-containers.cabal

@@ -133,9 +133,7 @@ benchmark benchmarks
     unordered-containers
 
   default-language: Haskell2010
-  ghc-options: -Wall -O2 -rtsopts "-with-rtsopts=-A32m"
-  if impl(ghc >= 8.6)
-    ghc-options: -fproc-alignment=64
+  ghc-options: -Wall -O2 -rtsopts "-with-rtsopts=-A32m" -fproc-alignment=64
   -- cpp-options: -DBENCH_containers_Map -DBENCH_containers_IntMap -DBENCH_hashmap_Map
 
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