[llvm] [LV] Consider interleaving when -enable-wide-lane-mask=true (PR #163387)

[David Sherwood via llvm-commits]

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@@ -1286,6 +1290,11 @@ class LoopVectorizationCostModel {
     return ScalarEpilogueStatus == CM_ScalarEpilogueAllowed;
   }
 
+  bool preferPredicatedEpilogue() const {
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david-arm wrote:

We don't currently have support for predicated vector epilogues (which the function name seems to be implying). Do you mean something like `preferPredicatedBody`?

https://github.com/llvm/llvm-project/pull/163387