This patch adds a micro-benchmark comparing Array#indexOf,
Array#includes, and a roughly equivalent `for` loop.

The benchmark can be used to measure any Array#{indexOf,includes}
optimizations we implement in the future.

Test:

    tools/run_perf.py --binary-override-path=out/x64.release/d8 \
      --filter=JSTests/ArrayIndexOfIncludesPolymorphic \
      --extra-flags=--trace-turbo test/js-perf-test/JSTests.json

Bug: v8:8388
Change-Id: I9150d3e56e9d4cb2ffe6baa50ee8cddf8df0ac74
Reviewed-on: https://chromium-review.googlesource.com/c/1307430Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57156}