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lib: optimize require() path walking

Rodrigo Muino Tomonari requested to merge github/fork/bnoordhuis/optimize-require-path-walking into v0.12

Remove a speed bump from commit 36777d2a by reusing the result of the previous stat() system call. It's a code path that gets called many thousands of times at startup in most applications so shaving off an extra system call can have an appreciable impact on startup times.

R=@chrisdickinson @robertkowalski

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