[test] Add performance test for closures.

test/js-perf-test/JSTests.json

 {
   "name": "JSTests",
   "run_count": 3,
   "run_count_arm": 1,
   "run_count_arm64": 1,
   "timeout": 120,
   "units": "score",
   "total": true,
   "resources": ["base.js"],
   "tests": [
@@ skipping 58 matching lines @@
       "path": ["Classes"],
       "main": "run.js",
       "resources": ["super.js", "default-constructor.js"],
       "results_regexp": "^%s\\-Classes\\(Score\\): (.+)$",
       "tests": [
         {"name": "Super"},
         {"name": "DefaultConstructor"}
       ]
     },
     {
+      "name": "Closures",
+      "path": ["Closures"],
+      "main": "run.js",
+      "resources": ["closures.js"],
+      "flags": [],
+      "results_regexp": "^Closures\\-Closures\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "Closures"}
+      ]
+    },
+    {
+      "name": "Closures",
+      "path": ["Closures"],
+      "main": "run.js",
+      "resources": ["closures.js"],
+      "flags": ["--mark_shared_functions_for_tier_up"],
+      "results_regexp": "^Closures\\-Closures\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "Closures"}

[Michael Achenbach, 2016/11/24 13:14:53]

I'm not sure if duplicate names work. How would that be unique on the perf
dashboard?

Also the regexp doesn't match what is printed.

+      ]
+    },
+    {
       "name": "Collections",
       "path": ["Collections"],
       "main": "run.js",
       "resources": [
         "common.js",
         "map.js",
         "run.js",
         "set.js",
         "weakmap.js",
         "weakset.js"
@@ skipping 142 matching lines @@
         {"name": "Object.hasOwnProperty--DEINTERN-prop"},
         {"name": "Object.hasOwnProperty--NE-INTERN-prop"},
         {"name": "Object.hasOwnProperty--NE-DEINTERN-prop"},
         {"name": "Object.hasOwnProperty--el"},
         {"name": "Object.hasOwnProperty--el-str"},
         {"name": "Object.hasOwnProperty--NE-el"}
       ]
     }
   ]
 }