[5.3][Property Wrappers] Only re-write assign_by_wrapper to assignment if all fields have been initialized. #31292
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if all fields have been initialized.
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AnthonyLatsis
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swift 5.3
🍒 release cherry pick
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Cherry-picked from #31248
Otherwise, the wrapped property's setter will be called with the potential to access uninitialized memory via observers.
Resolves: rdar://problem/60832285, rdar://problem/58312953
Resolves: SR-12341