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 <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed