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

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Sirraide wrote:

> Nope! Once the CI is done, feel free to Squash & Merge.

I would but I don’t have commit access, so someone else would have to do that for me. (Also, I do fear that in the time it takes for the CI jobs to complete, we’ll have another merge conflict w/ the release notes because they’re updated constantly.)

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