[PATCH] D48974: [DomTreeUpdater] Ignore updates when both DT and PDT are nullptrs

[Chijun Sima via Phabricator via llvm-commits]

NutshellySima created this revision.
NutshellySima added reviewers: dmgreen, davide, kuhar, brzycki, grosser.
Herald added a subscriber: llvm-commits.

Previously, when both DT and PDT are nullptrs and the UpdateStrategy is Lazy, DomTreeUpdater still pends updates inside.
After this patch, DomTreeUpdater will ignore all updates from(`applyUpdates()/insertEdge*()/deleteEdge*()`) in this case. (call `delBB()` still pends BasicBlock deletion until a flush event according to the doc).
The behavior of DomTreeUpdater previously documented won't change after the patch.


Repository:
  rL LLVM

https://reviews.llvm.org/D48974

Files:
  include/llvm/IR/DomTreeUpdater.h
  lib/IR/DomTreeUpdater.cpp

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