[llvm] Remove LLVM_ABI from members of RuntimeLibraryAnalysis (NFC) (PR #170850)

[Andrew Rogers via llvm-commits]

andrurogerz wrote:

> The class itself is marked as LLVM_ABI and it seems members shouldn't be. @andrurogerz Is that the the intended usage?

That's correct. If the class is annotated with `LLVM_ABI`, the no members are allowed to be annotated with `LLVM_ABI`.

https://github.com/llvm/llvm-project/pull/170850