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This commit improves setImmediate() performance by moving the try-finally block that wraps callback execution into a separate function because currently v8 never tries to optimize functions that contain try-finally blocks. With this change, there is a ~20-40% improvement in the included setImmediate() depth benchmarks. The breadth benchmarks show a slight improvement. PR-URL: https://github.com/nodejs/node/pull/4169 Reviewed-By: Minwoo Jung <jmwsoft@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>