[clang] [Clang] Remove unnecessary Decl transform & profiles for SizeOfPackExpr (PR #124533)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> In my comment here, it really looks like a clang-17 regression: [#124161 (comment)](https://github.com/llvm/llvm-project/issues/124161#event-16079402729)
> 
> From what I can tell you also address the simplified version, so I believe a release note is probably warrented.
> 
> Are there really multiple bugs here?

Yeah, this does appear to be a regression and so it warrants a release note. Reminder: please be sure to check back on issues to make sure we're addressing all of the comments (sometimes new information comes up in comments that's not reflected in the issue summary).

https://github.com/llvm/llvm-project/pull/124533