Add isPromise V8 extras util
This is used by streams in https://streams.spec.whatwg.org/commit-snapshots/1375e266b2fe8246bd95cb9d8a49876ba9359dc9/#rs-pipe-through This also fixes an omission in a6e635d6 that did not properly update the %OptimizeObjectForAddingMultipleProperties call in prologue.js. BUG=chromium:668951 R=gsathya@chromium.org,littledan@chromium.org Review-Url: https://codereview.chromium.org/2796243002 Cr-Commit-Position: refs/heads/master@{#44442}
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