[llvm] [LV] Transform to handle exits in the scalar loop (PR #148626)

[Florian Hahn via llvm-commits]

================
@@ -4224,12 +4232,17 @@ class VPlan {
   /// Returns the preheader of the vector loop region, if one exists, or null
   /// otherwise.
   VPBasicBlock *getVectorPreheader() {
+    if (EarlyExitPreheader)
----------------
fhahn wrote:

Yep, hence my qeustion here (https://github.com/llvm/llvm-project/pull/148626/files/3e5b9d9aa18afaf6aa9f71f374a0eafc9e4e10ca#r2533448617) + suggestion to add a VPlan printing test to see what exactly the plan looks like 

https://github.com/llvm/llvm-project/pull/148626