[clang] [clang][Sema] Fix crash on decomposition decl missing initializer (PR #210151)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> > > Just needs a release note, else this LGTM.
> > 
> > 
> > [22ca91c](https://github.com/llvm/llvm-project/commit/22ca91ce27af31f579a8a770a4d584f47bcc607f) (PR #127924) introduced the crash and landed a week ago on the dev branch. The new diagnostic didn't ship yet. Should we still add 'crash fix' to release notes or rather skip it?
> 
> A "week ago" is still old enough to have made it into the 23.0 branch! So we still need a release note HERE, but we probably also want to cherry-pick this to the release branch.

If we're cherry-picking to the release branch, no need for the release note at all, right? Clang 22.x is fine today and Clang 23.x will be fine after the cherry-pick, so Clang 24.x (main branch) doesn't need a note either?

https://github.com/llvm/llvm-project/pull/210151