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

[Chijun Sima via Phabricator via llvm-commits]

NutshellySima updated this revision to Diff 155028.
NutshellySima added a comment.

Address comments.
Change return type of `*Relaxed` into `void` and avoid unnecessary checks.


https://reviews.llvm.org/D48974

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

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