[llvm] [InlineCost]: Optimize inlining of recursive function. (PR #139982)

[Hassnaa Hamdi via llvm-commits]

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+; RUN: opt -passes='cgscc(inline),instcombine,cgscc(inline)' -S -debug-only=inline -disable-output < %s 2>&1 | FileCheck %s
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hassnaaHamdi wrote:

Here I just want to show the difference between this approach and the old approach in the other patch.
This tests shows that the recursive function will not get simplified unless the caller is the function itself, not another caller as the old patch was doing.

https://github.com/llvm/llvm-project/pull/139982