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TypeScript must hoist accessors for super properties when converting async method bodies to the `__awaiter` pattern for targets before ES2016. Previously, TypeScript would reify all property accesses into element accesses, i.e. convert the property name into a string parameter and pass it to `super[...]`. That breaks optimizers like Closure Compiler or Uglify in advanced mode, when property renaming is enabled, as it mixes quoted and un-quoted property access (`super['x']` vs just `x` at the declaration site). This change creates a variable `_superProps` that contains accessors for each property accessed on super within the async method. This allows accessing the properties by name (instead of quoted string), which fixes the quoted/unquoted confusion. The change keeps the generic accessor for element access statements to match quoting behaviour. Fixes #21088.