[llvm] [Windows] Fix Registry static data members not exported by extract_symbols.py in static builds with plugin support (PR #163391)

[via llvm-commits]

zond wrote:

@zmodem Alright - now we removed some crud from this PR, funnily with the help of the solution to https://github.com/llvm/llvm-project/issues/163349

https://github.com/llvm/llvm-project/pull/163391