[clang] [ClangOffloadBundler] make hipv4 and hip compatible (PR #91637)

[Joseph Huber via cfe-commits]

https://github.com/jhuber6 commented:

There's some code in the `clang-linker-wrapper` that creates the offloadbundler format for HIP offloading. I think it and the tests use `hipv4` which we could presumably remove now?

https://github.com/llvm/llvm-project/pull/91637