60de5b4983
In particular, avoid quadratic memory use in ZoneTextBuffer. Change-Id: I8d2ea77d35cd3c2c353ae557a2ee676ee8413653 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/95483 Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>