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benchmark: add microbenchmarks for ES Map

Rodrigo Muino Tomonari requested to merge github/fork/rvagg/es-map-bench into master

Given the discussion in #6102 about Map still being too slow to use I figured I'd see with a benchmark. @mscdex, @jasnell please review and let me know if you think this is valid.

es/map-bench.js method="pojo" millions="10": 1.07989
es/map-bench.js method="fakeMap" millions="10": 0.85223
es/map-bench.js method="map" millions="10": 1.77412

As for why the fakeMap test is faster ... I got nothing ...

Update after @fhinkel noticed a serious flaw:

v6

es/map-bench.js millions=1 method="object": 0.18984850416666324
es/map-bench.js millions=1 method="nullProtoObject": 0.16044478686078825
es/map-bench.js millions=1 method="fakeMap": 0.1311882248350222
es/map-bench.js millions=1 method="map": 0.3121014937928409

master

es/map-bench.js millions=1 method="object": 0.2220851555085364
es/map-bench.js millions=1 method="nullProtoObject": 0.19131381289232038
es/map-bench.js millions=1 method="fakeMap": 0.17931948397493905
es/map-bench.js millions=1 method="map": 0.28127750318241235

Times are ops/sec, so higher is better

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