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

[David Sherwood via llvm-commits]

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

Did you manage to find a way to get this from the CFG, rather than maintaining an internal `EarlyExitPreheader` variable?

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