[llvm] [NFC][LoopVectorize] Make replaceVPBBWithIRVPBB more efficient (PR #111514)

[via llvm-commits]

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@@ -440,6 +440,26 @@ class VPBlockBase {
     Successors.erase(Pos);
   }
 
+  /// This function replaces one predecessor with another, useful when
+  /// trying to replace an old block in the CFG with a new one.
+  void replacePredecessor(VPBlockBase *Old, VPBlockBase *New) {
+    auto I = find(Predecessors, Old);
+    assert(I != Predecessors.end());
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ayalz wrote:

Error message missing.

https://github.com/llvm/llvm-project/pull/111514