[clang] [LifetimeSafety] Avoid assert on variadic placement new (PR #199588)

[via cfe-commits]

================
@@ -2982,6 +2982,17 @@ void placement_new_heap_then_delete_use_after_free() {
   (void)*p;                  // expected-note {{later used here}}
 }
 
+struct PlacementArg {};
+
+struct VariadicPlacementNew {
+  void *operator new(decltype(sizeof(0)), ...);
----------------
NeKon69 wrote:

You can use `std::size_t`.

https://github.com/llvm/llvm-project/pull/199588
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