[llvm] [LV] -scalable-vectorization=preferred should not override UserVF=1 (PR #226948)

[David Sherwood via llvm-commits]

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@@ -132,8 +132,11 @@ LoopVectorizeHints::LoopVectorizeHints(const Loop *L,
 
   // If the flag is set to force any use of scalable vectors, override the loop
   // hints.
-  if (ForceScalableVectorization.getValue() !=
-      LoopVectorizeHints::SK_Unspecified)
+  // However: A preference must not turn a UserVF of 1, used by e.g.
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david-arm wrote:

nit: I think this should probably be `However, a preference ...`

https://github.com/llvm/llvm-project/pull/226948