[lldb] [clang] [NFC][Clang] Improve const correctness for IdentifierInfo (PR #79365)

[Bill Wendling via cfe-commits]

bwendling wrote:

> I'd like to wait a few weeks before we land it, I'm afraid these changes (which do contain some small white spaces-only changes too) might disrupt the release process as lot of cherry-picking between main and the llvm18 branch are happening and we should minimize the opportunity for merge conflicts.

That sounds good. Thanks!

https://github.com/llvm/llvm-project/pull/79365