[llvm] [MemProf] Handle missing tail call frames (PR #75823)

[Teresa Johnson via llvm-commits]

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+;; Test to make sure that missing tail call frames in memprof profiles are
+;; identified but not cloned when there are multiple non-unique possible
+;; tail call chains between the profiled frames.
+
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teresajohnson wrote:

I didn't end up including that here because I did a lot of manual clean up of the original test (for example there were calls to other functions like sleep and delete etc). So I'm not convinced there is a lot of value in including that here.

https://github.com/llvm/llvm-project/pull/75823