[llvm-branch-commits] [SPIRV] Move NewPM pass definitions to SPIRV.h (PR #218205)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/218205

To be consistent with all the other targets that have been ported to the
NewPM (BPF, WebAssembly, X86, Lanai, MSP430). These definitions are
pretty lightweight and putting them in a central place avoids a lot of
per-header boilerplate (namespaces, forward declarations, includes) that
one would otherwise need.