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We emit FUNCTION_TABLE[ptr], where FUNCTION_TABLE is a JS
array. That is a rare case where true is handled differently than 1
(a typed array or an add would cast, etc.), so we must explicitly cast
there.
Fixes an issue that existed before, but became a problem due to
#2869 which optimized some selects into a form that emitted a true
or a false, and if that was a function pointer, it could be bad, see
https://app.circleci.com/pipelines/github/emscripten-core/emscripten/6699/workflows/0c4da49c-75d0-4b0a-8fac-686a8330a3fe/jobs/336520
The new test/wasm2js/indirect-select.2asm.js.opt output shows
what happened there.
Verified as passing emscripten's wasm2js1 wasm2js2 test suites.
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