<atomic>: Fix missing ARM64EC ifdefs
#2702
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CaseyCarter
approved these changes
May 4, 2022
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This mirrors Victor Tong's internal MSVC-PR-396294 "Fix missing ARM64EC ifdefs in atomic header" (as of Iteration 3, with fixed
#endifcomments).It fixes
atomic_thread_fence()which wasn't emitting a fence, and also fixes_Atomic_storage<_Ty, 8>::store().