[llvm] [DecoderEmitter] Support for DecodeOrder and `resolve-conflicts-try-all` (PR #157948)

[Rahul Joshi via llvm-commits]

jurahul wrote:

That's my current thinking. I'll look into the 3rd call tomorrow in more detail and see if we can generalize it, but what I am proposing seems safe to do first to avoid a large fallout and then try to unify.

https://github.com/llvm/llvm-project/pull/157948