[clang] [llvm] Revert "[HLSL] Set visibility of cbuffer global variables to internal" (PR #202538)

[Jan Patrick Lehr via cfe-commits]

jplehr wrote:

The CI errors we are seeing here should go away once https://github.com/llvm/llvm-project/pull/202558 lands.

https://github.com/llvm/llvm-project/pull/202538