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

[via llvm-commits]

llvmbot wrote:

<!--IGNORE-->
>/cherry-pick https://github.com/llvm/llvm-project/commit/12836467b76c56872b4c22a6fd44bcda696ea720

Error: Command failed due to missing milestone.

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