[clang] [Clang] suppress deprecated field warnings in implicit special-member functions (PR #147400)

[Corentin Jabot via cfe-commits]

================
@@ -547,6 +547,12 @@ static void DoEmitAvailabilityWarning(Sema &S, AvailabilityResult K,
     return;
   }
   case AR_Deprecated:
+    // Suppress -Wdeprecated-declarations in purely implicit special-member
----------------
cor3ntin wrote:

```suggestion
    // Suppress -Wdeprecated-declarations in implicit
```

https://github.com/llvm/llvm-project/pull/147400