benchmark: avoid TurboFan deopt in arrays bench

Something unidentified at the moment is causing the arrays benchmarks to deopt when run with the TurboFan compiler. Refactor the test to use an inner function that can be correctly optimized by TurboFan and Crankshaft. Refs: #11851 (comment)
nodejs · targos · Mar 17, 2017 · Mar 17, 2017 · f6c144af16592bfb38f5442252d915b3b8da9dc1
commit f6c144af16592bfb38f5442252d915b3b8da9dc1
diff --git a/benchmark/arrays/var-int.js b/benchmark/arrays/var-int.js
@@ -27,9 +27,13 @@ function main(conf) {
   bench.start();
   var arr = new clazz(n * 1e6);
   for (var i = 0; i < 10; ++i) {
+    run();
+  }
+  bench.end(n);
+
+  function run() {
     for (var j = 0, k = arr.length; j < k; ++j) {
       arr[j] = (j ^ k) & 127;
     }
   }
-  bench.end(n);
 }
diff --git a/benchmark/arrays/zero-float.js b/benchmark/arrays/zero-float.js
@@ -27,9 +27,13 @@ function main(conf) {
   bench.start();
   var arr = new clazz(n * 1e6);
   for (var i = 0; i < 10; ++i) {
+    run();
+  }
+  bench.end(n);
+
+  function run() {
     for (var j = 0, k = arr.length; j < k; ++j) {
       arr[j] = 0.0;
     }
   }
-  bench.end(n);
 }
diff --git a/benchmark/arrays/zero-int.js b/benchmark/arrays/zero-int.js
@@ -27,9 +27,13 @@ function main(conf) {
   bench.start();
   var arr = new clazz(n * 1e6);
   for (var i = 0; i < 10; ++i) {
+    run();
+  }
+  bench.end(n);
+
+  function run() {
     for (var j = 0, k = arr.length; j < k; ++j) {
       arr[j] = 0;
     }
   }
-  bench.end(n);
 }