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ARM64 CPUs don't use __rdtsc to get the CPU cycle counter because that
is an x86/x64 specific instruction. This change updates ThreadTicks to
use the appropriate counter on ARM64 builds on Win32.

Bug: 893460
Change-Id: Ia9679aa8d560f887c5a787b9e6f333ceed9d1192
Reviewed-on: https://chromium-review.googlesource.com/c/1301577Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609467}