[llvm] [NFC]Update a ThinLTO test case (PR #117584)

[Teresa Johnson via llvm-commits]

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@@ -48,6 +48,13 @@
 ; RUN: llvm-dis %t1.bc.thinlto.bc -o - | FileCheck %s --check-prefix=DIS
 ; DIS: aliasee: null
 
+; function-import pass crashed when alias is imported but aliasee doesn't.
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teresajohnson wrote:

I think the comment and TODO can now be removed?

https://github.com/llvm/llvm-project/pull/117584