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}
PR-URL: https://github.com/nodejs/node/pull/7814
Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>
52cba4147d