[llvm-branch-commits] [SPIRV] Introduce CodeGenPassBuilder (PR #218268)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/218268

This is the equivalent of TargetPassConfig for the NewPM. This currently
mirrors the existing TPC as closely as possible, but with TODOs for
passes that have not yet been ported to the NewPM.