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Observed this taking ~2% of debug gen_snapshot time. TEST=ci Change-Id: I657148904fe2b5a8f3dfbd006c3d1327aa3866ef Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/506261 Reviewed-by: Tess Strickland <sstrickl@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>