Adjust GHC options as recommended by tasty-bench (#513)

* `--nonmoving-gc` is no longer recommended
* `-fproc-alignment=64` is recommended especially for comparisons
  between code versions

Author: sjakobi

unordered-containers.cabal

@@ -133,7 +133,7 @@ benchmark benchmarks
     unordered-containers
 
   default-language: Haskell2010
-  ghc-options: -Wall -O2 -rtsopts "-with-rtsopts=-A32m --nonmoving-gc"
+  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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