[clang] [Clang] Support MSPropertyRefExpr as placement arg to new-expression (PR #75883)

[via cfe-commits]

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@@ -2286,6 +2286,9 @@ ExprResult Sema::BuildCXXNew(SourceRange Range, bool UseGlobal,
   bool PassAlignment = getLangOpts().AlignedAllocation &&
                        Alignment > NewAlignment;
 
+  if (CheckArgsForPlaceholders(PlacementArgs))
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Sirraide wrote:

Makes sense. It seems like this affects only a small number of builtin types, so in theory, adding tests for every expression that could possibly have those types ought to do (if we don’t already have tests for those); I’m currently collecting a list of everything that could be affected by this.

https://github.com/llvm/llvm-project/pull/75883