[llvm] [ADT] Add APIntOps::abds signed absolute difference and rename absdiff -> abdu (PR #84791)

[Simon Pilgrim via llvm-commits]

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@@ -2188,8 +2188,13 @@ 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 signed.
+inline const APInt abds(const APInt &A, const APInt &B) {
+  return A.sge(B) ? (A - B) : (B - A);
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RKSimon wrote:

Thanks, I always tend towards being overly cautious within ternary

https://github.com/llvm/llvm-project/pull/84791