[clang] [Clang] Implement P2747 constexpr placement new (PR #104586)

[via cfe-commits]

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@@ -245,7 +245,7 @@ namespace std {
 namespace PlacementNew {
   constexpr int foo() { // both-error {{never produces a constant expression}}
     char c[sizeof(int)];
-    new (c) int{12}; // ref-note {{call to placement 'operator new'}} \
+    new (c) int{12}; // ref-note {{this placement new expression is not yet 
supported in constant expressions}} \
----------------
cor3ntin wrote:

not C++26

https://github.com/llvm/llvm-project/pull/104586
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