[llvm] [offload][AMDGPU] Add dynamic HSA version and symbol checks (PR #228569)

[Robert Imschweiler via llvm-commits]

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ro-i wrote:

not really necessary to guard the version check itself since it's just going to return not HSA_STATUS_SUCCESS if it's not available, which means that version checks correctly fail.
I think the new version of my commit handles the dlopen situation better now

https://github.com/llvm/llvm-project/pull/228569