[llvm] [GlobalISel] convergence control tokens and intrinsics (PR #67006)

[Matt Arsenault via llvm-commits]

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@@ -121,6 +132,8 @@ bool CallLowering::lowerCall(MachineIRBuilder &MIRBuilder, const CallBase &CB,
     CanBeTailCalled = false;
   }
 
+  if (!hasConvergenceEntryToken(CB))
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arsenm wrote:

Don't understand this part; if there's any relation between tail call and convergence I would expect it to be the opposite 

https://github.com/llvm/llvm-project/pull/67006