[js-perf-test] add microbenchmarks for Object.values(), Object.entries()

test/js-perf-test/JSTests.json

 {
   "name": "JSTests",
   "run_count": 5,
   "run_count_android_arm": 3,
   "run_count_android_arm64": 3,
   "timeout": 120,
   "units": "score",
   "total": true,
   "resources": ["base.js"],
   "tests": [
@@ skipping 92 matching lines @@
       "tests": [
         {"name": "Untagged"},
         {"name": "LargeUntagged"},
         {"name": "Tagged"}
       ]
     },
     {
       "name": "Object",
       "path": ["Object"],
       "main": "run.js",
-      "resources": ["assign.js"],
+      "flags": "--harmony",
+      "resources": [
+        "assign.js",
+        "values.js",
+        "entries.js"
+      ],
       "results_regexp": "^%s\\-Object\\(Score\\): (.+)$",
       "tests": [
-        {"name": "Assign"}
+        {"name": "Assign"},
+        {"name": "Values"},
+        {"name": "Entries"}
       ]
     },
     {
       "name": "Scope",
       "path": ["Scope"],
       "main": "run.js",
       "resources": ["with.js"],
       "results_regexp": "^%s\\-Scope\\(Score\\): (.+)$",
       "tests": [
         {"name": "With"}
@@ skipping 23 matching lines @@
         {"name": "for-in"},
         {"name": "for-in hasOwnProperty()"},
         {"name": "for (i < Object.keys().length)"},
         {"name": "Object.keys().forEach()"},
         {"name": "for (i < array.length)"},
         {"name": "for (i < length)"}
       ]
     }
   ]
 }