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The recently added timer performance test for __rdtsc fails to compile
on ARM64, for obvious reasons. This change fixes the test to use the
ARM64 cycle counter when building for that platform.

The ReadCycleCounter definition was copied from base\time\time_win.cc

Bug: 893460
Change-Id: I0d891c5a197e097084a765ab66e9da1b4173b418
Reviewed-on: https://chromium-review.googlesource.com/c/1394987Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619820}