benchmarks: remove more boilerplate.

Many of our benchmarks are basically just "call one function with a
fixed argument". We don't need to keep repeating all the boilerplate for
that.

This also ensures we don't forget the benchmark::DoNotOptimize, which --
in addition to being a good idea in general -- specifically solves the
problem with gettid benchmark and provides a more accurate result by
removing the indirection through a function pointer.

Test: ran benchmarks
Change-Id: Id67535243678cd0d48f51cf25141e2040da9af03

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