[bitcoin/bitcoin] travis: Run bench_bitcoin once (#13811)

> WARNING: This is a debug build — may result in slower benchmarks.

Maybe it would make more sense to introduce an additional stage «benchmark» which does a non-debug build and perform the benchmark in there?

Also it would clearly separate it visually when looking at travis. The only thing that sucks about this approach that it requires an additional build = additional travis run time. But given the extensive caching being done this should be okay.

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