[llvm] [CodeGen][ARM64EC] Add support for hybrid_patchable attribute. (PR #92965)

[Jacek Caban via llvm-commits]

cjacek wrote:

I added tests for taking the address. I also added a test of dllexport. In this case, the output looks weird, but that's compatible with MSVC. I think we could as well not be compatible here and make it work with something like https://github.com/cjacek/llvm-project/commit/4febef20ab27ef4440e9dccf3cc65dd6be1f4d7c on top of this PR.

https://github.com/llvm/llvm-project/pull/92965