[llvm] [lld] [mlir] [clang] [AMDGPU] Change default AMDHSA Code Object version to 5 (PR #73000)

[David Blaikie via cfe-commits]

dwblaikie wrote:

(part of the point is so that patches can be reverted as needed without having to revert/reapply huge patches when they aren't actually dependent)

https://github.com/llvm/llvm-project/pull/73000