[clang] [SYCL] AST support for SYCL kernel entry point functions. (PR #122379)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

3 comments are all 'nits', so once those conversations are resolved, this LGTM.  Please resolve those 3 before merging.

https://github.com/llvm/llvm-project/pull/122379