[llvm-branch-commits] [clang] Reland: [clang] Track function template instantiation from definition… (PR #127777)

[Matheus Izvekov via llvm-branch-commits]

mizvekov wrote:

This is a cherry-pick of https://github.com/llvm/llvm-project/pull/125266 into the 20.x release branch.

https://github.com/llvm/llvm-project/pull/127777