[llvm] [LV] Fix strict weak ordering violation in handleUncountableEarlyExits sort (PR #181462)

[Luke Lau via llvm-commits]

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@@ -1533,3 +1533,57 @@ latch.exit:
 early.exit:
   ret i64 %iv
 }
+
+; Single early exit going to the same block as the latch exit. This exercises
+; the sort in handleUncountableEarlyExits with Exits.size()==1.
+define i64 @single_early_exit_same_exit_as_latch() {
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lukel97 wrote:

I think this test is already covered in `single_early_exit.ll`, does the crash reproduce there?

https://github.com/llvm/llvm-project/pull/181462