This commit complements the support for the `__spreadArray` helper that was added in microsoft/TypeScript#41523. The prior helpers `__spread` and `__spreadArrays` used the `__read` helper internally, but the helper is now emitted as an argument to `__spreadArray` so ngcc now needs to support evaluating it statically. The real implementation of `__read` reads an iterable into an array, but for ngcc's static evaluation support it is sufficient to only deal with arrays as is. Additionally, the optional `n` parameter is not supported as that is only emitted for array destructuring syntax, which ngcc does not have to support. PR Close #41201
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License: MIT