This adds support for Promise.all() to --async-stack-traces (also at
zero cost, since we can derive the relevant information from the resolve
element closure and context). In case of `Promise.all(a)` the stack
trace even tells you which element of `a` is responsible, for example

```js
async function fine() {}
async function thrower() { await fine(); throw new Error(); }
async function test() { await Promise.all([fine(), thrower()]); }
```

will generate the following stack trace

```
Error
    at thrower (something.js:1:9)
    at async Promise.all (index 1)
    at async test (something.js:3:3)
```

so it not only shows the async Promise.all() frames, but even tells the
user exactly that the second element of `[fine(), thrower()]` is the
relevant one.

Bug: v8:7522
Change-Id: I279a845888e06053cf0e3c9338ab71caabaabf45
Reviewed-on: https://chromium-review.googlesource.com/c/1299248Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57023}