[llvm] [Offload] Change HSA header search order (PR #95769)

[Shilei Tian via llvm-commits]

shiltian wrote:

I think https://discourse.llvm.org/t/18-1-7-released/79433 said there would be no LLVM 18 unless there is serious issue. Not sure this would be counted as one. @tstellar 

https://github.com/llvm/llvm-project/pull/95769