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timers: improve setImmediate() performance

Rodrigo Muino Tomonari requested to merge github/fork/mscdex/timers-improve-immediate-perf into master
Checklist
  • make -j4 test (UNIX), or vcbuild test nosign (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)
  • timers
Description of change

This commit avoids re-creating a new immediate queue object every time the immediate queue is processed. Additionally, a few functions are tweaked to make them inlineable.

These changes result in ~6-7% improvement in the existing setImmediate() benchmarks and should help reduce GC work.

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