[clang] [Sema] Don't call isNonConstantStorage on incomplete variable types (PR #161590)

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

This change needs a release note.
Please add an entry to `clang/docs/ReleaseNotes.rst` in the section the most adapted to the change, and referencing any Github issue this change fixes. Thanks!

https://github.com/llvm/llvm-project/pull/161590