[llvm] Add more missing `LLVM_ABI` annotations (PR #168765)

[Nikita Popov via llvm-commits]

================
@@ -14,7 +14,7 @@
 
 namespace llvm {
 
-class LLVM_ABI RuntimeLibraryAnalysis
+class RuntimeLibraryAnalysis
----------------
nikic wrote:

Why did this get dropped?

https://github.com/llvm/llvm-project/pull/168765