This moves AsyncFunctionAwait{Caught,Uncaught} to CSA, and removes async-await.js. BUG=v8:5639 Review-Url: https://codereview.chromium.org/2643023002 Cr-Commit-Position: refs/heads/master@{#42579}
It shipped with Chrome 55 stable. R=littledan@chromium.org Review-Url: https://codereview.chromium.org/2621173002 Cr-Commit-Position: refs/heads/master@{#42203}