replace labs with ternary

Author: dg-pb

Objects/listobject.c

@@ -1831,7 +1831,7 @@ binarysort(MergeState *ms, const sortslice *ss, Py_ssize_t n, Py_ssize_t ok)
             _binarysort_BISECT(aL, aR);
             _binarysort_INSORT(aL, M);
 
-            std += labs(aL - mu);
+            std += mu < aL ? aL - mu : mu - aL;
             std /= 2;    // EWMA with alpha=0.5
             mu = aL;
         }
@@ -1900,7 +1900,7 @@ binarysort(MergeState *ms, const sortslice *ss, Py_ssize_t n, Py_ssize_t ok)
             assert(aL == aR);
             _binarysort_INSORT(aL, M);
 
-            std += labs(aL - mu);
+            std += mu < aL ? aL - mu : mu - aL;
             std /= 2;    // EWMA with alpha=0.5
             std_max += !(ok % 4);
             mu = aL;