[clang] [HIP] Fix OffloadBundler triple when using extra 'llvm' environment (PR #214841)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> Should fix the runtime

That's very unreasonable, as this means that you cannot use the `-llvm` variant with any standard installation of ROCm for probably a year. We already have a function that does this for the same reason, and I'd really like to be able to actually use this feature. We *should* stop hard coding it in the runtime, but we can do that independently of being able to actually use it. As it stands, you literally *cannot* run any HIP program with any existing HIP runtime if you use this triple.

https://github.com/llvm/llvm-project/pull/214841