add _M_ARM64 support
add _M_ARM64 support

¯\_(ツ)_/¯

Cq-Include-Trybots: skia.primary:Build-Win-MSVC-arm64-Debug
Change-Id: I48dd439fffff004c9ee7f36ecbe834a964286726
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/208279
Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Commit-Queue: Brian Osman <794c0b5534edf5601d88e1d41975d0262da12894@google.com>
Auto-Submit: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Reviewed-by: Brian Osman <794c0b5534edf5601d88e1d41975d0262da12894@google.com>

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