[llvm] [ProfileData] Only keep module functions when reading ProfileSymbolList (PR #227113)

[Farid Zakaria via llvm-commits]

fzakaria wrote:

@kazutakahirata I bet @apolloww knows more about it and likely has looked at it, but I've let him know either way.
I'd still like to land this, because the string-based list stays the default (+ what we currently use) and I think it's worth making that path cheap too.

https://github.com/llvm/llvm-project/pull/227113