[inspector] followup with adding missing entry to JSTests.json

TBR=jgruber@chromium.org

Bug: v8:7078
Change-Id: I032bb6c8a9d1079ac9d8f69f6bef3de32f6e78ca
Reviewed-on: https://chromium-review.googlesource.com/772250Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49393}

test/js-perf-test/JSTests.json

@@ -607,7 +607,8 @@
       "tests": [
         {"name": "Debugger.paused"},
         {"name": "Runtime.evaluate(String16Cstor)"},
-        {"name": "Debugger.getPossibleBreakpoints"}
+        {"name": "Debugger.getPossibleBreakpoints"},
+        {"name": "AsyncStacksInstrumentation"}
       ]
     },
     {