[llvm] [LoopUnroll] Consider convergence control tokens when unrolling (PR #91715)

[Matt Arsenault via llvm-commits]

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@@ -45,6 +46,9 @@ struct CodeMetrics {
   /// True if this function contains a call to a convergent function.
   bool convergent = false;
 
+  /// True if the code contains an uncontrolled convergent operation.
+  bool convergentUncontrolled = false;
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arsenm wrote:

Maybe combine these into a ConvergenceType field?

https://github.com/llvm/llvm-project/pull/91715