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Krisztián SzűcsWes McKinney
286d9fdeccf
Krisztián Szűcs authored and Wes McKinney committed e7e43dd6303
ARROW-9110: [C++] Fix CPU cache size detection on macOS

Querying locally shows my RAM size at the first position:

```
❯ sysctl -a | grep hw\.cachesize
hw.cachesize: 68719476736 32768 262144 16777216 0 0 0 0 0 0
```

I'm unsure how to test it, it has fixed running the benchmarks locally for me.

Closes #7408 from kszucs/ARROW-9110

Authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Wes McKinney <wesm@apache.org>