[llvm] [AMDGPU][ASAN] Handle special GVs lowering in amdgpu-sw-lower-lds (PR #161827)

[Sameer Sahasrabuddhe via llvm-commits]

https://github.com/ssahasra requested changes to this pull request.

Given the uncertainty surrounding the programming model for named barriers, I believe the minimum requirement for a way forward is to move all these "special GVs" under a flag which clearly uses "experimental" in its spelling, and rename all the builtins and GV names to also include the string "experimental".

https://github.com/llvm/llvm-project/pull/161827