add micro-benchmark for Proxy with PreventExtensions trap

Bug: v8:6664
Change-Id: Iaef787b3b0c2a24de57b7c3a5c4e75e5a723228e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1652061
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62101}

test/js-perf-test/JSTests4.json

@@ -35,7 +35,9 @@
         {"name": "SetSymbolWithTrap"},
         {"name": "HasInIdiom"},
         {"name": "IsExtensibleWithoutTrap"},
-        {"name": "IsExtensibleWithTrap"}
+        {"name": "IsExtensibleWithTrap"},
+        {"name": "PreventExtensionsWithoutTrap"},
+        {"name": "PreventExtensionsWithTrap"}
       ]
     },
     {

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

@@ -550,3 +550,44 @@ newBenchmark("IsExtensibleWithTrap", {
     return value === true;
   }
 });
+
+// ----------------------------------------------------------------------------
+
+obj = {};
+value = false;
+
+newBenchmark("PreventExtensionsWithoutTrap", {
+  setup() {
+    p = new Proxy(obj, {});
+  },
+  run() {
+    for(var i = 0; i < ITERATIONS; i++) {
+      value = Object.preventExtensions(p);
+    }
+    return value;
+  },
+  teardown() {}
+});
+
+// ----------------------------------------------------------------------------
+
+obj = {};
+value = false;
+
+newBenchmark("PreventExtensionsWithTrap", {
+  setup() {
+    p = new Proxy(obj, {
+      preventExtensions: function(target) {
+        Object.preventExtensions(target);
+        return true;
+      }
+    });
+  },
+  run() {
+    for(var i = 0; i < ITERATIONS; i++) {
+      value = Object.preventExtensions(p);
+    }
+    return value;
+  },
+  teardown() {}
+});