[llvm] [llvm] get cl::opt instantiations working with MSVC DLL build (PR #147810)

[Andrew Rogers via llvm-commits]

andrurogerz wrote:

> I wonder in what other occurrences of similar patterns things got exported mining the field for similar (but not yet seen) issues?

I haven't found any other issues like this one with the set of exported templates instances. 

https://github.com/llvm/llvm-project/pull/147810