This is similar to how the native context has an empty function set up as it's closure field.
BUG=666984
Review-Url: https://codereview.chromium.org/2528603002
Cr-Commit-Position: refs/heads/master@{#41212}
- Creates a new promise-utils.{h, cc} which refactors out the
logic to create resolving functions. This is shared between the
runtime functions and builtins.
- Changes PromiseResolveThenableJobInfo to store the context
since we no longer create the resolving functions in JS.
- Changes EnqueuPromiseResolveThenableJob to take in the promise and
not the callbacks.
BUG=v8:5343
Review-Url: https://codereview.chromium.org/2487053002
Cr-Commit-Position: refs/heads/master@{#40941}
