[llvm] [IR] Add new Range attribute using new ConstantRange Attribute type (PR #83171)

[Nikita Popov via llvm-commits]

nikic wrote:

Hm yeah, unlike the other attributes, this one has a non-trivial dtor, so we can't just stick in to the general LLVMContext BumpPtrAllocator.

https://github.com/llvm/llvm-project/pull/83171