Move benching into testing. (denoland/deno_std#258)

Original: 4de86f04de

benching/example.ts

@@ -1,29 +0,0 @@
-// https://deno.land/std/benching/mod.ts
-import { BenchmarkTimer, runBenchmarks, bench } from "./mod.ts";
-
-// Simple
-bench(function forIncrementX1e9(b: BenchmarkTimer) {
-  b.start();
-  for (let i = 0; i < 1e9; i++);
-  b.stop();
-});
-
-// Reporting average measured time for $runs runs of func
-bench({
-  name: "runs100ForIncrementX1e6",
-  runs: 100,
-  func(b: BenchmarkTimer) {
-    b.start();
-    for (let i = 0; i < 1e6; i++);
-    b.stop();
-  }
-});
-
-// Itsabug
-bench(function throwing(b) {
-  b.start();
-  // Throws bc the timer's stop method is never called
-});
-
-// Bench control
-runBenchmarks({ skip: /throw/ });