[clang] [llvm] [HLSL] Adding Flatten and Branch if attributes (PR #116331)

[Paul Kirth via cfe-commits]

https://github.com/ilovepi commented:

LGTM from me, and thanks for cleaning this up so promptly.  Also, for the record, if you want to put things in MD_prof, please do add support to ProfDataUtils. We're happy to support all the various usecases, so if your stuff belongs there, please add it. Also, if there's a greater need for managing various metadata, I'd be happy to discuss how to support things other than MD_prof in a more general support library.

https://github.com/llvm/llvm-project/pull/116331