Add deprecate to @ember/debug

[NullVoxPopuli]

All the context here: emberjs/ember-cli-babel#441

To test if this actually solves the above:
Repro of emberjs/ember-cli-babel#441: https://github.com/NullVoxPopuli/repo-repro-ember-cli-babel-441

• run yarn

Separate Terminal

• checkout this branch for ember-rfc176-data
• yarn
• yarn link

Back in the other terminal

• yarn link "ember-rfc176-data"
• ember test
  See:

{"type":"error","text":"Uncaught ReferenceError: deprecate is not defined at http://localhost:7357/assets/my-app-test-deprecate.js, line 28\n","testContext":{}}

Which is actually no different from pre-this change. I need to pair this with seeing if Ember.deprecate exists. Stand by.

---

update, it does:

So... more debugging. sorry for the noise -- if anyone can convert this to draft before I finish debugging, that'd be much appreciate (also, why does github not allow me to do this to my own PRs?)

[NullVoxPopuli]

Going to continue investigation on the babel issue, as I'm re-starting from the app->down