[llvm] [LLVM][IR] Add constant range support for floating-point types (PR #86483)

[Joshua Cranmer via llvm-commits]

https://github.com/jcranmer-intel commented:

Not entirely clear to me from the UI whether or not the range is half-open or closed, which tends to matter more for floating-point values than it does for integers.

If it's half-open, then how is one supposed to represent `[inf, inf]`?

https://github.com/llvm/llvm-project/pull/86483