[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:

I’ll take a look at what other expressions are actually affected by this other than `MSPropertyRefExpr`s. (or do you mean we should just add more placement-new tests in general? Because I would assume we already have a bunch of those, but I haven’t checked to be fair?)

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