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src: add option to set cpu affinity of mainthread

Rodrigo Muino Tomonari requested to merge github/fork/qdaoming/daomingq-set-mainthread-cpu-affinity into main

Add runtime option '--set-mainthread-cpu-affinity' to pin the mainthread to the current running cpu before entering event loop. This feature is implemented on Linux OS currently.

Enabling this option will benefit node.js applications running on heavy-workload system and can increase performance for several node.js benchmarks, ex., several cases in benchmark/vm/ improved by 40%.

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