[llvm] [FuncAttrs] Relax norecurse attribute inference (PR #139943)

[David Sherwood via llvm-commits]

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david-arm wrote:

nit: The naming convention of the tests seems a little odd, perhaps better just all lowercase, i.e. `norecurse_libfunc_no_address_taken.ll`?

https://github.com/llvm/llvm-project/pull/139943