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Revert "Elide tree walks (#48413)" (#49886)

This reverts commit 46ccd086745bb9ade53f2457f3bb91942b2af970.
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Shi-Hao Hong committed
effc01905452a5d67a1e3bd9a028520592adffd2
Parent: 46ccd08
Committed by GitHub <noreply@github.com> on 1/31/2020, 4:20:04 PM