[llvm] [NFC] Fix outdated RecurKind comments (PR #144014)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> Sorry, I was going off of these two commits which say they unify the int and float kinds, am I misunderstanding this?

Yeah, they unify select(icmp(), x, y) and select(fcmp(), x, y). The comparison can be integer or float type, but the select operands (and the reduction op) are still restricted to be integer type, unfortunately.

https://github.com/llvm/llvm-project/pull/144014