[llvm] [llvm-readobj][COFF] Add support for version 2 of CHPE metadata (PR #109545)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

The versioning here is a little weird... I thought normally they prefer to store the size of the struct in a field instead.  But if this is how it works, it's fine.

https://github.com/llvm/llvm-project/pull/109545