[llvm] [Attributor] Prevent infinite loop in AAGlobalValueInfoFloating (PR #94941)

[Johannes Doerfert via llvm-commits]

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+; RUN: opt < %s -passes=attributor
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jdoerfert wrote:

Add a brief comment what this tests, basically what went wrong and why.

https://github.com/llvm/llvm-project/pull/94941