[llvm] [llvm] revisions to `LLVM_ABI` export macro definitions (PR #144598)

[Andrew Rogers via llvm-commits]

andrurogerz wrote:

@compnerd this PR includes a few changes to the `LLVM_ABI` annotation definitions. I am curious if you had something else in mind with CMake, but I did not find a way to combine with `LLVM_BUILD_STATIC` since it is used as an override for tools that don't want to link with the DLL.

https://github.com/llvm/llvm-project/pull/144598