drop @newStackCall

this was causing unrelated behavior tests to fail.

if this commit is reverted, the docs are good, but `@newStackCall` is
already deprecated in favor of `@call`, supplying the `stack` property.
17c8f108a4Andrew Kelley committed on 1/30/2020, 10:51:55 PMparent4d2fed6
7 files changedLine totals unavailable