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sync: align poolLocal to CPU cache line size
Make poolLocal size multiple of 128, so it aligns to CPU cache line on the most common architectures. This also has the following benefits: - It may help compiler substituting integer multiplication by bit shift inside indexLocal. - It shrinks poolLocal size from 176 bytes to 128 bytes on amd64, so now it fits two cache lines (or a single cache line on certain Intel CPUs - see https://software.intel.com/en-us/articles/optimizing-application-performance-on-intel-coret-microarchitecture-using-hardware-implemented-prefetchers). No measurable performance changes on linux/amd64 and linux/386. Change-Id: I11df0f064718a662e77a85d88b8a15a8919f25e9 Reviewed-on: https://go-review.googlesource.com/40918 Reviewed-by: Dmitry Vyukov <email@example.com> Run-TryBot: Dmitry Vyukov <firstname.lastname@example.org> TryBot-Result: Gobot Gobot <email@example.com>
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