[llvm] [APInt] Add APIntOps::absdiff to compute the absolute difference of 2 unsigned values (PR #82255)

[Simon Pilgrim via llvm-commits]

================
@@ -2187,6 +2187,11 @@ inline const APInt &umax(const APInt &A, const APInt &B) {
   return A.ugt(B) ? A : B;
 }
 
+/// Determine the absolute difference of two APInts considered to be unsigned.
+inline const APInt absdiff(const APInt &A, const APInt &B) {
+  return umax(A, B) - umin(A, B);
----------------
RKSimon wrote:

Sure no problem, is this purely for ease of understanding or anything else? 

https://github.com/llvm/llvm-project/pull/82255