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

[Rahul Joshi via llvm-commits]

jurahul wrote:

LMK if this current plan of adding a new heuristic seems reasonable and I work on cleaning up the code (maybe after your latest refactor goes in).

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