AST: consume newValue in synthesized setters #82979
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The `newValue` is an owned value whose only use is to be stored, so we
can synthesize this instead:
```
set { prop = consume newValue }
```
which improves -Onone code quality by avoiding a copy/destroy pair.
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The
newValueis an owned value whose only use is to be stored, so we can synthesize this instead:which improves -Onone code quality by avoiding a copy/destroy pair.