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On illumos systems, check for the "zone.cpu-cap" resource control when
determining how many usable CPUs are available. If the resource control
is not set, or we are unable to read it, ignore the failure and return
the value we used to return; i.e., the CPU count from
sysconf(_SC_NPROCESSORS_ONLN).
Fixes golang/go#35199
Change-Id: Ic8a408f84cd140d544d128f1281baad527fb5e35
Reviewed-on: https://go-review.googlesource.com/c/go/+/203758
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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