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

[via cfe-commits]

================
@@ -309,7 +309,7 @@ namespace placement_new_delete {
   constexpr bool bad(int which) {
     switch (which) {
     case 0:
-      delete new (placement_new_arg{}) int; // ref-note {{call to placement 
'operator new'}} \
+      delete new (placement_new_arg{}) int; // ref-note {{this placement new 
expression is not yet supported in constant expression}} \
----------------
cor3ntin wrote:

not C++26

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