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deps: backport 2bcbe2f from V8 upstream

Rodrigo Muino Tomonari requested to merge github/fork/ofrobots/perf-buffering-6.x into v6.x
Checklist
  • make -j4 test (UNIX), or vcbuild test nosign (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)
Description of change
Excessive buffering of perf map files in V8 could cause profiles
to be missing symbols at times.

Original commit message:
  switch perf and ll_prof loggers to line buffering

  BUG=v8:5015
  R=jarin@chromium.org,yangguo@chromium.org

  Review-Url: https://codereview.chromium.org/2041243002
  Cr-Commit-Position: refs/heads/master@{#36788}

Note that this is not needed on master as V8 5.1 already contains this fix. R=@nodejs/v8

EDIT: CI: https://ci.nodejs.org/job/node-test-pull-request/3362/

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