[llvm] [AMDGPU] Add dynamic LDS size implicit kernel argument to CO-v5 (PR #65273)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> @arsenm Please let me know if any other changes are required?

Main thing I'm not sure of is the handling of dynamic LDS uses outside of kernels - we need the use to be visible in the parent kernels. I'd need to check how those are currently handled 

https://github.com/llvm/llvm-project/pull/65273