[llvm] [LangRef] Clarify specification for float min/max operations (PR #172012)

[Nikita Popov via llvm-commits]

nikic wrote:

Based on https://discourse.llvm.org/t/rfc-a-consistent-set-of-semantics-for-the-floating-point-minimum-and-maximum-operations/89006/61?u=nikic, I've dropped the requirement for zero ordering from maxnum/minnum.

So basically now minnum == fmin == IEEE 754-2008 minNum modulo usual sNaN exception.

https://github.com/llvm/llvm-project/pull/172012