Fix two classes of "unreachable code" warnings in Firefox.#1071

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nevkontakte merged 2 commits intogopherjs:masterfrom

nevkontakte:issue-575

Oct 4, 2021

Commits on Oct 3, 2021

Eliminate an unreachable statement at the end of a flattened loop.
nevkontakte
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Improve detection of the last return statement in a statement list.
nevkontakte
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