[llvm] [PGO] Do not promote an indirect call over a known set of targets (PR #222518)

[Henry Jiang via llvm-commits]

mustartt wrote:

I'm not confident that the way this is currently implemented is always profitable. We can potentially tune the cost model to drive better ICP decisions based on this. 

Do you happen to have any data on the impact of this patch on, say `llvm-test-suite`?

Same with https://github.com/llvm/llvm-project/pull/222514

https://github.com/llvm/llvm-project/pull/222518