[promises] cleanup default promise handlers
Use private symbols to mark default promise handler, instead of calling out to default handlers defined in JS. We check for this symbol in PromiseHandle and perform the appropriate behavior as the default handlers. Catch prediction logic is updated to account for a symbol. BUG=v8:5343 Review-Url: https://codereview.chromium.org/2695593002 Cr-Commit-Position: refs/heads/master@{#43135}
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