[clang] [AMDGPU] Replace old reference to `amdgcn-amd-amdhsa' triple (PR #209317)

[Matt Arsenault via cfe-commits]

arsenm wrote:

> Summary: This made some cases use the wrong triple while we are migrating to using `amdgpu` instead.

At this moment clang should continue using amdgcn 



https://github.com/llvm/llvm-project/pull/209317