[llvm] [LoopVectorize] Teach LoopVectorizationLegality about more early exits (PR #107004)

[Florian Hahn via llvm-commits]

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@@ -446,6 +480,9 @@ class LoopVectorizationLegality {
   /// specific checks for outer loop vectorization.
   bool canVectorizeOuterLoop();
 
+  /// Returns true if this is an early exit loop that can be vectorized.
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fhahn wrote:

It would probably be helpful to summarize the required conditions here (or somewhere else)

https://github.com/llvm/llvm-project/pull/107004