[ASDAlexander77]

Summary

The lazy iterator helpers take their source over, as in JavaScript. Under -mm=own:

• take, filter and map say @keeps("iter"); filter and map also keep callbackFn. The generator's state owns them, so const seq = fib().map(f) can be stored or returned.
• drop returned iter itself. It is now a @keeps generator that skips limit values.

Depends on ASDAlexander77/TypeScriptCompiler#699 (@keeps on a generator). Merge that first.

Tests

• With the compiler from #699:
  • The DefaultLib suites pass every test under rc, gc and none.
  • own goes from 137 to 139/170: iterator_map and iterator_filter now pass, with no new failures.
• Still failing under own:
  • iterator_take and iterator_drop, on their Set values() lines: a temporary Set dies while the values() state borrows it.
  • iterator_reduce, on its string accumulator.

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