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fs,module: add module-loader-only realpath cache

Rodrigo Muino Tomonari requested to merge github/fork/addaleax/fs-module-only-rpcache into master
Checklist
  • make -j4 test (UNIX), or vcbuild test nosign (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

fs, module

Description of change

Reintroduce a realpath cache with the same mechanisms which existed before b488b19e (fs: optimize realpath using uv_fs_realpath()), but only for the synchronous version and with the cache being passed as a hidden option to make sure it is only used internally.

The cache is hidden from userland applications because it has been decided that fully reintroducing as part of the public API might stand in the way of future optimizations.

/cc @nodejs/fs @bzoz

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