[llvm] [llvm] annotate recently added interfaces for DLL export (PR #150101)

[James Henderson via llvm-commits]

jh7370 wrote:

I'm really concerned that this is going to constantly rot, with people not knowing about or not knowing when they need to add the `LLVM_ABI` tag to a function. Build bots will help, once there's a consumer that requires the tag, but will equally just be an annoyance/forgotten etc. If finding where it is needed is being done via an automatic system already, would it be possible to fully automate it, such that developers don't have to care about whether they need to add the tag or not (i.e. the automation will take care of it)? 

https://github.com/llvm/llvm-project/pull/150101