[llvm] [mlir] mlir/Presburger/MPInt: move into llvm/ADT (PR #94953)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> Copy and pasting from MathExtras is not acceptable.

Well, what do you propose we do? I don't know if these three little functions are broadly applicable to LLVM in their current state. The hope is that we'll be able to consolidate mlir/MathExtras with llvm/MathExtras in the future, but let's not distract ourselves from the goal of moving MPInt into llvm.

https://github.com/llvm/llvm-project/pull/94953