[clang] [Sema] Handle large shift counts in GetExprRange (PR #68590)

[Björn Pettersson via cfe-commits]

bjope wrote:

> So the change itself looks right. The comment at the top of the test belongs in the commit message/github discussion, not in the test itself.
> 
> Also, needs a release note.

Thanks. I pushed an update. It fixes the test case to just explain the purpose of the tests. And I added info to the ReleaseNotes.

Note: I've never edited release notes for clang in the past, so please let me know if that should go somewhere else or if I missed something about what it should look like, etc. 

https://github.com/llvm/llvm-project/pull/68590