[llvm] [llvm] annotate interfaces in llvm/SandboxIR for DLL export (PR #142863)

[Andrew Rogers via llvm-commits]

andrurogerz wrote:

Please have another look at the manual fix-ups in the middle commit. My changes to `GlobalWithNodeAPI::LLVMGVToGV::operator` clean up the declarations and make the DLL build properly with both MSVC and clang-cl.

https://github.com/llvm/llvm-project/pull/142863