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

[Paul Walker via llvm-commits]

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@@ -446,6 +480,10 @@ class LoopVectorizationLegality {
   /// specific checks for outer loop vectorization.
   bool canVectorizeOuterLoop();
 
+  /// Returns true if this is a supported early exit loop that we can
+  /// vectorize.
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paulwalker-arm wrote:

What does "supported" mean in this context? Would it suffice to say "Returns true if this is an early exit loop that can be vectorized".

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