[llvm] [RFC][TableGen] Require DAG argument for complex operands in InstAlias (PR #136411)

[Rahul Joshi via llvm-commits]

jurahul wrote:

I'll defer to others on the review if this change is ok from a interface POV, will look at tablegen if it's deemed ok. @s-barannikov is this backward in-compatible change? 

https://github.com/llvm/llvm-project/pull/136411