[llvm] [ConstantRange] Fix off by 1 bugs in UIToFP and SIToFP handling. (PR #86041)

[via llvm-commits]

llvmbot wrote:

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>/cherry-pick https://github.com/llvm/llvm-project/commit/6295e677220bb6ec1fa8abe2f4a94b513b91b786

Error: Command failed due to missing milestone.

https://github.com/llvm/llvm-project/pull/86041