Bug 1054630 - Part 1: Add plumbing for SpiderMonkey parser telemetry. r=till
Bug 1054630 - Part 2: Collect telemetry on usage of SpiderMonkey's deprecated for-each. r=till
Bug 1054630 - Part 3: Collect telemetry on usage of SpiderMonkey's deprecated destructuring for-in. r=till
Bug 1054630 - Part 4: Collect telemetry on usage of SpiderMonkey's deprecated legacy generators. r=till
Bug 1054630 - Part 5a: Replace some deprecated expression closures with arrow functions in browser/. r=till
Bug 1054630 - Part 5b: Collect telemetry on usage of SpiderMonkey's deprecated expression closures. r=till