Filtering of cost-center profiler output no longer works

With the following testcase,

import Control.Monad (replicateM)

main :: IO ()
main = do
    let xs = replicate 10000000 $ 42
    print $ length xs
    print $ sum xs

Running like this,

ghc -prof -auto-all Hi.hs && ./Hi +RTS -hy[] -hc

with 7.10.3 produces a useful profile with the output one would expect. 8.0.1-rc2, on the other hand produces empty samples.

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