- Nico's improvements to memchr; didn't help perf on Windows, but to avoid diverging.
- Fix bug in ninja-deplist-helper that could cause crash when growing database
  sometimes.
Review URL: https://chromiumcodereview.appspot.com/10377038

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@135743 0039d316-1c4b-4281-b951-d872f2087c98