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

[Yingwei Zheng via llvm-commits]

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dtcxzyw wrote:

`isSupportedSemantics` has been removed. I will add fcmp support with exhaustive testing infrastructure in follow-up patches.


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