[llvm] HP PA-RISC architecture initial build support (PR #121220)

[Helge Deller via llvm-commits]

hdeller wrote:

> > Can you please reference in the commit message the corresponding commit in the google/benchmark repo? It'll make life easier when we sync. Thanks.
> 
> Here is the pull request for the commit in google/benchmark repo: [google/benchmark#1894](https://github.com/google/benchmark/pull/1894)

Info: The pull request for benchmark project has been resolved & closed since the changes were just merged into mainline repo.

https://github.com/llvm/llvm-project/pull/121220