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Backport 12153 to 7.x: buffer,util: refactor for performance

Rodrigo Muino Tomonari requested to merge github/fork/Trott/backport-12153 into v7.x-staging

internal/util.js definied toInteger() and toLength() but they were only used by buffer.js. Inlining these small functions results in a small but statistically-significant performance gain.

PR-URL: https://github.com/nodejs/node/pull/12153 Reviewed-By: Joyee Cheung joyeec9h3@gmail.com Reviewed-By: Michaël Zasso targos@protonmail.com Reviewed-By: James M Snell jasnell@gmail.com

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

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