tree b51a1f1d69d1483d2e7e76358a038c300849e8e5
parent bfff605c826532690442abbe2d81125c65eb52ec
author Bryan Henry <bryanhenry@google.com> 1659659538 -0700
committer Brett Wilson <brettw@chromium.org> 1659740424 +0000

[gn] Don't read entire build.ninja into memory in gn gen/clean

This switches ExtractRegenerationCommands to use std::istream rather
than reading the whole file just to use the first ~10 lines.

Change-Id: I2a77c24541edd20d3f5e20130199855148e304fc
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/14321
Reviewed-by: Brett Wilson <brettw@chromium.org>