add micro-benchmark for proxy trap getPrototypeOf

Bug: v8:664
Change-Id: I180a59462bd22a1f2378a59fd31edbb539603a1f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1659569
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62227}

test/js-perf-test/JSTests4.json

@@ -37,7 +37,9 @@
         {"name": "IsExtensibleWithoutTrap"},
         {"name": "IsExtensibleWithTrap"},
         {"name": "PreventExtensionsWithoutTrap"},
-        {"name": "PreventExtensionsWithTrap"}
+        {"name": "PreventExtensionsWithTrap"},
+        {"name": "GetPrototypeOfWithoutTrap"},
+        {"name": "GetPrototypeOfWithTrap"}
       ]
     },
     {

test/js-perf-test/Proxies/proxies.js

@@ -591,3 +591,37 @@ newBenchmark("PreventExtensionsWithTrap", {
   },
   teardown() {}
 });
+
+// ----------------------------------------------------------------------------
+
+newBenchmark("GetPrototypeOfWithoutTrap", {
+  setup() {
+    p = new Proxy({}, {});
+  },
+  run() {
+    for(var i = 0; i < ITERATIONS; i++) {
+      value = Object.getPrototypeOf(p);
+    }
+    return value;
+  },
+  teardown() {}
+});
+
+// ----------------------------------------------------------------------------
+
+newBenchmark("GetPrototypeOfWithTrap", {
+  setup() {
+    p = new Proxy({}, {
+      getPrototypeOf: function(target) {
+        return Array.prototype;
+      }
+    });
+  },
+  run() {
+    for(var i = 0; i < ITERATIONS; i++) {
+      value = Object.getPrototypeOf(p);
+    }
+    return value;
+  },
+  teardown() {}
+});