Implement only poll() and not select() in JS #25990
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ktock
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This change improves the implementation of poll() to support blocking when called from threads (see emscripten-core#25523) and moves the select-based-on-poll implemenation from being wasmfs specific to be always being used.
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This change improves the implementation of poll() to support blocking when called from threads (see #25523) and moves the select-based-on-poll implementation from being wasmfs specific to be always being used.
Also, add testing for blocking version of poll by duplicating the blocking select test.