[llvm] [llvm][AsmPrinter] Add direct calls to callgraph section (PR #155706)

[Paul Kirth via llvm-commits]

https://github.com/ilovepi commented:

so, you emit a label at every call site, right? and then you write out the address of the label w/ each callee symbol?

So if I have a hundred calls to foo in my function, I get 100 entries? Am I understanding that right? 

https://github.com/llvm/llvm-project/pull/155706