[llvm] [LoopUnroll] Rotate loop before unrolling inside of UnrollRuntimeLoopRemainder (PR #148243)

[via llvm-commits]

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@@ -69,6 +72,18 @@ enum class LoopUnrollResult {
   FullyUnrolled
 };
 
+/// Represents the result of a \c UnrollRuntimeLoopRemainder invocation.
+enum class LoopReminderUnrollResult {
+  /// The loop reminder was not modified.
+  Unmodified,
+
+  /// The loop was rotated, but not unrolled.
+  Rotated,
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annamthomas wrote:

Not really needed anymore in the approach suggested below.

https://github.com/llvm/llvm-project/pull/148243