Chris Tate e3e37940f1 Iterate iterable unions without an array arm and adapt into optional Iterables ...

for-of over an iterable union read its array arm without checking that it
had one, so iterating a `Set<number> | Generator<number, void, undefined>`
crashed the compiler; a union without an array arm now runs the generator
loop only. A generator with a non-void return channel adapted into a
required Iterable<T> slot but not into an optional or nullable one, where
the conversion failed with SC2003; the slot conversion now accepts
iterable unions with undefined or null arms beside the iterable arms.

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corpus

Iterate iterable unions without an array arm and adapt into optional Iterables

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coverage-fixtures

Throw for every object on the right of an arrow instanceof, and give blocked bodies their this

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deadstrip

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diagnostics

Compile Iterable<T> values

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ffi

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fixtures

Compile chalk 5 and hot-shots 8 from built-in shims with callable class instances (#1836)

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harness

Iterate iterable unions without an array arm and adapt into optional Iterables

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library-mode

Add the cstring class to library profiles

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test262

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wasm-spec

Merge main

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