Add Iterators and the for..of loop

features/iterators.yml

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+name: Iterators and the for...of loop
+description: The `for...of` loop operates on a sequence of values sourced from an iterable object, such as arrays, array-like objects, DOM collections, iterators, generators, and user-defined iterables. All built-in iterators inherit from the `Iterator` class.
+group: iterators
+snapshot: ecmascript-2015
+spec:
+  - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-%iteratorprototype%-object
+  - https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements
+status:
+  compute_from: javascript.statements.for_of
+compat_features:
+  - javascript.builtins.Iterator
+  - javascript.builtins.Iterator.@@iterator
+  - javascript.statements.for_of
+  - javascript.statements.for_of.closing_iterators

features/iterators.yml.dist

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+# Generated from: iterators.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "38"
+    chrome_android: "38"
+    edge: "12"
+    firefox: "13"
+    firefox_android: "14"
+    safari: "7"
+    safari_ios: "7"
+compat_features:
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "38"
+  #   chrome_android: "38"
+  #   edge: "12"
+  #   firefox: "13"
+  #   firefox_android: "14"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - javascript.statements.for_of
+
+  # baseline: high
+  # baseline_low_date: 2016-09-20
+  # baseline_high_date: 2019-03-20
+  # support:
+  #   chrome: "38"
+  #   chrome_android: "38"
+  #   edge: "12"
+  #   firefox: "17"
+  #   firefox_android: "17"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - javascript.builtins.Iterator
+
+  # baseline: high
+  # baseline_low_date: 2016-09-20
+  # baseline_high_date: 2019-03-20
+  # support:
+  #   chrome: "38"
+  #   chrome_android: "38"
+  #   edge: "12"
+  #   firefox: "36"
+  #   firefox_android: "36"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - javascript.builtins.Iterator.@@iterator
+
+  # baseline: high
+  # baseline_low_date: 2017-04-19
+  # baseline_high_date: 2019-10-19
+  # support:
+  #   chrome: "51"
+  #   chrome_android: "51"
+  #   edge: "14"
+  #   firefox: "53"
+  #   firefox_android: "53"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - javascript.statements.for_of.closing_iterators