Tests asynchronous call stacks for async functions.

Set timer for test function.
Captured call stacks in no particular order:
Call stack:
    0) errorCallback (async-callstack-async-await1.js:66)
    1) doTestSettledPromisesRejected (async-callstack-async-await1.js:98)
    [await]
    0) testFunctionTimeout (async-callstack-async-await1.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await1.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) promiseCallback (async-callstack-async-await1.js:74)
    1) doTestPromiseConstructor (async-callstack-async-await1.js:72)
    2) testFunctionTimeout (async-callstack-async-await1.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await1.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) thenCallback (async-callstack-async-await1.js:61)
    1) doTestPromiseConstructor (async-callstack-async-await1.js:76)
    [await]
    0) testFunctionTimeout (async-callstack-async-await1.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await1.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) thenCallback (async-callstack-async-await1.js:61)
    1) doTestSettledPromisesResolved (async-callstack-async-await1.js:86)
    [await]
    0) testFunctionTimeout (async-callstack-async-await1.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await1.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>