lib: replace Kahan summation with MathSumPrecise

Signed-off-by: LiviaMedeiros <livia@cirno.name>

Author: LiviaMedeiros

lib/internal/bench_runner/benchmark.js

@@ -13,6 +13,7 @@ const {
   MathMin,
   MathRound,
   MathSqrt,
+  MathSumPrecise,
   Number,
   NumberIsFinite,
   NumberMAX_SAFE_INTEGER,
@@ -485,18 +486,6 @@ class BenchContext {
   }
 }
 
-function arithmeticMean(values) {
-  let sum = 0;
-  let compensation = 0;
-  for (let i = 0; i < values.length; i++) {
-    const adjusted = values[i] - compensation;
-    const next = sum + adjusted;
-    compensation = (next - sum) - adjusted;
-    sum = next;
-  }
-  return sum / values.length;
-}
-
 function summarizeSamples(samples) {
   const rates = [];
   let min = Infinity;
@@ -508,7 +497,7 @@ function summarizeSamples(samples) {
     max = MathMax(max, rate);
   }
 
-  const mean = arithmeticMean(rates);
+  const mean = MathSumPrecise(rates) / rates.length;
   let variance = 0;
   for (let i = 0; i < rates.length; i++) {
     const difference = rates[i] - mean;