Add async iterators and the for await..of loop

features/async-iterators.yml

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+name: Async iterators and the for await..of loop
+description: Asynchronous iterator objects, such as those returned by promises or generator functions, are iterable with the `for await .. of` loop.
+group: iterators
+snapshot: ecmascript-2018
+spec:
+  - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-asynciteratorprototype
+  - https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements
+compat_features:
+  - javascript.builtins.AsyncIterator
+  - javascript.builtins.AsyncIterator.@@asyncIterator
+  - javascript.builtins.Symbol.asyncIterator
+  - javascript.statements.for_await_of
+  - javascript.statements.for_of.async_iterators

features/async-iterators.yml.dist

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+# Generated from: async-iterators.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-01-15
+  baseline_high_date: 2022-07-15
+  support:
+    chrome: "63"
+    chrome_android: "63"
+    edge: "79"
+    firefox: "57"
+    firefox_android: "57"
+    safari: "12"
+    safari_ios: "12"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2017-12-06
+  # baseline_high_date: 2020-06-06
+  # support:
+  #   chrome: "63"
+  #   chrome_android: "63"
+  #   edge: "12"
+  #   firefox: "57"
+  #   firefox_android: "57"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - javascript.statements.for_of.async_iterators
+
+  # baseline: high
+  # baseline_low_date: 2020-01-15
+  # baseline_high_date: 2022-07-15
+  # support:
+  #   chrome: "63"
+  #   chrome_android: "63"
+  #   edge: "79"
+  #   firefox: "57"
+  #   firefox_android: "57"
+  #   safari: "11.1"
+  #   safari_ios: "11.3"
+  - javascript.builtins.AsyncIterator
+  - javascript.builtins.AsyncIterator.@@asyncIterator
+  - javascript.builtins.Symbol.asyncIterator
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2020-01-15
+  # baseline_high_date: 2022-07-15
+  # support:
+  #   chrome: "63"
+  #   chrome_android: "63"
+  #   edge: "79"
+  #   firefox: "57"
+  #   firefox_android: "57"
+  #   safari: "12"
+  #   safari_ios: "12"
+  - javascript.statements.for_await_of