[llvm] [TableGen] Support automatic type deduction (PR #109434)

[Rahul Joshi via llvm-commits]

jurahul wrote:

Agreed, but that just means that the use of auto here needs to be reevaluated as code changes. Just because a hammer cannot drill holes doesn't mean that a hammer is not useful. IMO auto is a tool that can be convenient to use when it makes sense, similar to C++ auto. But it seems not a lot of folks agree or care about, so this may not be worth pursuing.

https://github.com/llvm/llvm-project/pull/109434