When profiling, don't add cost centres in Data.Binary.Get

This change speeds up profiling by an order of magnitude.
Without it, the >>= function for Get dominates runtime completely during profiling.

src/runtime/haskell/Data/Binary/Get.hs

@@ -1,4 +1,6 @@
 {-# LANGUAGE CPP, MagicHash #-}
+-- This module makes profiling a lot slower
+{-# OPTIONS_GHC -fno-prof-auto #-}
 -- for unboxed shifts
 
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