[6.0] [stdlib] Enforce that atomic representations are BitwiseCopyable #73956
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This is a cherry pick of #73734
Explanation: Marks
AtomicRepresentable.AtomicRepresentation
andAtomicOptionalRepresentable.AtomicOptionalRepresentation
asBitwiseCopyable
.Scope: Synchronization module
Issue: rdar://128296144.
Original PR: #73734
Risk: Very Low, atomics are always expected to store bitwise copyable values.
Testing: Ci
Reviewer: @nate-chandler and @lorentey