[clang] [llvm] [clang] Introduce CallGraphSection codegen option (PR #117037)

[Prabhu Rajasekaran via llvm-commits]

Prabhuk wrote:

@arsenm -- The patches that precede this change in llvm have landed. I am planning to land this early next week if there are no objections.

https://github.com/llvm/llvm-project/pull/117037