[DAG] Add command line option and TLI hook to enable DAG topological sorting (#188636) The very first step towards #83422 - which will move DAG combines to be processed in topological order. There is a lot of churn on existing tests that need to be addressed before this can be switched on globally, this patch gives the ability to enable it both on a per-target basis, and via a command line option to assist with testing and triage. At the moment I'm focusing on addressing the x86 regressions (example in the patch's basic test coverage) as that's the target I'm most familiar with and will help with many other targets as well, but there might be other/simpler targets that would benefit from earlier handling.
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