[js-perf-test] Specify AsyncAwait tests in JSTests.json

BUG=v8:5805

Review-Url: https://codereview.chromium.org/2619753002
Cr-Commit-Position: refs/heads/master@{#42127}

test/js-perf-test/JSTests.json

@@ -18,7 +18,12 @@
         "baseline-naive-promises.js"
       ],
       "flags": ["--allow-natives-syntax"],
-      "results_regexp": "^%s\\-AsyncAwait\\(Score\\): (.+)$"
+      "results_regexp": "^%s\\-AsyncAwait\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "BaselineES2017"},
+        {"name": "BaselineNaivePromises"},
+        {"name": "Native"}
+      ]
     },
     {
       "name": "Generators",