[llvm] Overhaul the TargetMachine and LLVMTargetMachine Classes (PR #111234)

[Matin Raayai via llvm-commits]

matinraayai wrote:

@aeubanks which one? I just fixed the issues regarding TM usage added in the past 2 weeks.

> although precommit CI looks relevant



https://github.com/llvm/llvm-project/pull/111234