Add missing LLVM_ABI annotations#12674

Steelskin wants to merge 1 commit intoswiftlang:stable/21.xswiftlang/llvm-project:stable/21.xfrom

Steelskin:fabrice/swift-llvm-dll-missing-abiSteelskin/llvm-project:fabrice/swift-llvm-dll-missing-abiCopy head branch name to clipboard