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readline: remove the caching variable

line 486 and 525 contain for loops where a length property is cached in a variable (for example, itemLen). This used to be a performance optimization, but current V8 handles the optimization internally.

these caching variables are removed, and using the length property directly instead.

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

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