[ADT] Drop "const" from "const APInt" (NFC) (llvm#138825)

Author: kazutakahirata

llvm/include/llvm/ADT/APInt.h

@@ -2234,12 +2234,12 @@ inline const APInt &umax(const APInt &A, const APInt &B) {
 }
 
 /// Determine the absolute difference of two APInts considered to be signed.
-inline const APInt abds(const APInt &A, const APInt &B) {
+inline APInt abds(const APInt &A, const APInt &B) {
   return A.sge(B) ? (A - B) : (B - A);
 }
 
 /// Determine the absolute difference of two APInts considered to be unsigned.
-inline const APInt abdu(const APInt &A, const APInt &B) {
+inline APInt abdu(const APInt &A, const APInt &B) {
   return A.uge(B) ? (A - B) : (B - A);
 }