[llvm] Emit newline after IR-dump banner in PrintCallGraphPass (PR #199410)

[Prerona Chaudhuri via llvm-commits]

pchaudhuri-nv wrote:

> This would benefit from a test.

Hello @boomanaiden154 

Thanks for the feedback, it has been incorporated.

https://github.com/llvm/llvm-project/pull/199410