Fix reading cycle count on non-msvc win-on-aarch64 #4724
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This closes #4723
This seems fairly portable across all aarch64 systems, be it Windows or Linux.
The arm 32bit intrinsic seems to be Microsoft-Specific, so I don't know how to implement this for arm32.
I don't think either gcc or clang support 32bit arm Windows though, so at least the issue with the undefined variable is solved.