[llvm] Remove the assertion to unblock breakages (PR #88035)

[via llvm-commits]

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@@ -140,13 +140,6 @@ class PseudoProbeManager {
     // be different and result in different checksums. So we should use the
     // state from the new (available_externally) function, which is saved in its
     // attribute.
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WenleiHe wrote:

nit: leave a TODO comment? 

https://github.com/llvm/llvm-project/pull/88035