haskell-generic-builder: rename withBenchmarkDepends argument to doBenchmark
haskell-generic-builder: rename withBenchmarkDepends argument to doBenchmark

This partially undoes the change from 8788bfe762ab30952b67e09be2c001a9c022e1e3.
The 'doBenchmark' name is more consistent with the naming scheme used for
other phases, like 'doCheck', 'doHaddock', etc.

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