[llvm] Revert "[VPlan] Remove unnecessary DomTreeUpdater flush (NFC)." (PR #144758)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms

@llvm/pr-subscribers-vectorizers

Author: Arthur Eubanks (aeubanks)

<details>
<summary>Changes</summary>

This reverts commit 2e337349f436d75af112c081df5ec683871cbcc8.

Causes breakages internally, will post reproducer later.

---
Full diff: https://github.com/llvm/llvm-project/pull/144758.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/VPlan.cpp (+2) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.cpp b/llvm/lib/Transforms/Vectorize/VPlan.cpp
index 4332332ef5cc3..773a5a4a829c7 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlan.cpp
@@ -1015,6 +1015,8 @@ void VPlan::execute(VPTransformState *State) {
   for (VPBlockBase *Block : RPOT)
     Block->execute(State);
 
+  State->CFG.DTU.flush();
+
   VPBasicBlock *Header = vputils::getFirstLoopHeader(*this, State->VPDT);
   if (!Header)
     return;

``````````

</details>


https://github.com/llvm/llvm-project/pull/144758