[llvm] Refactoring changes to support emitting call graph section (PR #83176)

[Paul Kirth via llvm-commits]

https://github.com/ilovepi commented:

The message in these commits seems to refer to an unrelated phabricator review. 

In particular `[MIPS][CallSiteInfo][NFC] Fill CallSiteInfo only when needed` doesn't seem to be related  https://reviews.llvm.org/D107108 at all.

https://github.com/llvm/llvm-project/pull/83176