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

[Jan Patrick Lehr via cfe-commits]

jplehr wrote:

The compile errors in pre-commit come from a file that this change touches, but has not been touched directly by this change. I wonder how this worked before.

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