[lld] [llvm] [LLD][COFF] Add more variety of CET flags (PR #150761)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

To emphasize the layering, I think this would be good to split into two separate PRs, one for adding support for the new flags in `llvm-readobj`, and one for making LLD produce them.

https://github.com/llvm/llvm-project/pull/150761