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

[David Sherwood via llvm-commits]

david-arm wrote:

Or we could also apply a weight or hotness to calls, where recursive calls are essentially hotter? Just for the record, I'm not expecting you to solve all the problems at once in this initial patch, but we might be able to sketch out an initial algorithm as part of this work, even if it is only limited to recursive functions for now.

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