add some benchmarks
Summary: For great speed Test Plan: $ fbmake opt && _bin/folly/wangle/wangle-bench ============================================================================ folly/wangle/test/Benchmark.cpp relative time/iter iters/s ============================================================================ constantFuture 235.92ns 4.24M promiseAndFuture 100.37% 235.04ns 4.25M withThen 41.97% 562.17ns 1.78M ---------------------------------------------------------------------------- oneThen 539.03ns 1.86M twoThens 64.01% 842.14ns 1.19M fourThens 39.27% 1.37us 728.62K hundredThens 1.82% 29.63us 33.75K ============================================================================ Reviewed By: davejwatson@fb.com Subscribers: trunkagent, net-systems@, fugalh, exa, njormrod FB internal diff: D1587871
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