[llvm] [FuncSpec] Consider literal constants of recursive functions (PR #111162)

[Alexandros Lamprineas via llvm-commits]

labrinea wrote:

Can we remove `promoteConstantStackValues()` ? Do you see any regressions doing so? As far as I remember that was a hack for exchange2_r, since fortran passes arguments by reference.

https://github.com/llvm/llvm-project/pull/111162