[llvm] [LV][NFC] Emit remarks when failing to vectorise early exit loops (PR #225078)

[Florian Hahn via llvm-commits]

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@@ -3192,8 +3212,12 @@ static bool handleUncountableExitsWithSideEffects(
   SmallVector<VPInstruction *, 8> ConditionRecipes;
 
   VPValue *Cond = getRecipesForUncountableExit(ConditionRecipes, LatchVPBB);
-  if (!Cond)
+  if (!Cond) {
+    reportVectorizationFailure("Unable to determine early exit condition for "
+                               "loop with side effects.\n",
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fhahn wrote:

Do we need `\n` here? I think we do not pass them in other places, and it will add extra newlines to the output? (Also the yaml output)

https://github.com/llvm/llvm-project/pull/225078