[clang] [llvm] [clang-tools-extra] [lldb] [flang] [compiler-rt] [libcxx] [lld] [YAMLParser] Unfold multi-line scalar values (PR #70898)

[Scott Linder via llvm-commits]

https://github.com/slinder1 requested changes to this pull request.

I don't mean to make existing debt your problem, but if it isn't too much work could you post a pre-patch that just adds the `FileCheck`s to the existing tests where the behavior changes, so the test diff is more self-documenting?

I left some comments but not so much about spec compliance as I don't have the time right now to work through it right now.

Either way, thank you for the work, and I'm happy to see the parser move towards more compliant parsing!

https://github.com/llvm/llvm-project/pull/70898