Add benchmark for TypedArray.prototype.set for different types

Add a benchmark for TypedArray.prototype.set when
setting from another TypedArray with a different type.

Bug: v8:6704
Change-Id: Iad5585fe7d3a28b5b1a1b1f85ec81be659959239
Reviewed-on: https://chromium-review.googlesource.com/613267
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47343}

test/js-perf-test/JSTests.json

@@ -331,6 +331,12 @@
           "resources": ["construct-all-typedarrays.js"],
           "test_flags": ["construct-all-typedarrays"]
         },
+        {
+          "name": "SetFromDifferentType",
+          "main": "run.js",
+          "resources": ["set-from-different-type.js"],
+          "test_flags": ["set-from-different-type"]
+        },
         {
           "name": "SetFromSameType",
           "main": "run.js",

test/js-perf-test/TypedArrays/set-from-different-type.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+new BenchmarkSuite('SetFromDifferentType', [1000], [
+  new Benchmark('SetFromDifferentType', false, false, 0, SetFromDifferentType),
+]);
+
+const length = 16;
+
+
+const dest_arrays = [
+    new  Uint8Array(length),
+    new  Int8Array(length),
+    new  Uint16Array(length),
+    new  Int16Array(length),
+    new  Uint32Array(length),
+    new  Int32Array(length),
+    new  Float32Array(length),
+    new  Float64Array(length),
+    new  Uint8ClampedArray(length)
+];
+
+let uint8_array = new Uint8Array(length);
+let int32_array = new Int32Array(length);
+let float32_array = new Float32Array(length);
+let float64_array = new Float64Array(length);
+for (let i = 0; i < length; i++) {
+  uint8_array[i] = i;
+  int32_array[i] = i;
+  float32_array[i] = i;
+  float64_array[i] = i;
+}
+
+function SetFromDifferentType() {
+  for(typed_dest of dest_arrays) {
+    typed_dest.set(uint8_array);
+    typed_dest.set(int32_array);
+    typed_dest.set(float32_array);
+    typed_dest.set(float64_array);
+  }
+}