[llvm] [CSSPGO][NFC] Remove unused code in finalizeWeightPropagation() (PR #175521)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM. Thanks for the cleanup.

I'm kind of surprised this was not caught by anyone building with `-Wunused`.

https://github.com/llvm/llvm-project/pull/175521