[llvm] [LoopVectorize] Add support for vectorisation of simple early exit loops (PR #88385)

[Graham Hunter via llvm-commits]

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@@ -294,6 +294,10 @@ template <class BlockT, class LoopT> class LoopBase {
   /// Otherwise return null.
   BlockT *getUniqueExitBlock() const;
 
+  /// Return the exit block for the latch if one exists. This function assumes
+  /// the loop has a latch.
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huntergr-arm wrote:

I think all loops have at least one latch (a branch back to the header of the loop). Perhaps 'This function assumes the loop has a single latch.'?

https://github.com/llvm/llvm-project/pull/88385