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Add guard to avoid using x86 header for ARM64
Resolves this error
./base/atomicops_internals_x86_msvc.h(62,3):  error: use of
 undeclared identifier '__faststorefence' __faststorefence();

Bug: 893460
Change-Id: I82b31e0470c63b4465b430768a73071722e16ed3
Reviewed-on: https://chromium-review.googlesource.com/c/1301195Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604657}