cpu: aarch64: fix xbyak functions for /sys access failures cherrypick#1773 #1835
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There are platforms with /sys not mounted. skip handling HW caps for such platforms.
This fixes the issue# pytorch/pytorch#115482
I ran subset of benchdnn tests on aarch64 Linux (AWS Graviton3) platform, but didn't test on Mac.
Description
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Fixes # (github issue)
Checklist
General
make test
andmake test_benchdnn_*
) pass locally for each commit?Performance improvements
New features
Bug fixes
RFC PR