[llvm] llvm: Add missing `LLVM_ABI` annotations (PR #171629)

[Nikita Popov via llvm-commits]

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@@ -1379,7 +1379,7 @@ class ConstantPtrAuth final : public Constant {
   /// the only global-initializer user of the ptrauth signed pointer.
   LLVM_ABI Constant *getAddrDiscriminator() const;
 
-  Constant *getDeactivationSymbol() const;
+  LLVM_ABI_FOR_TEST Constant *getDeactivationSymbol() const;
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nikic wrote:

```suggestion
  LLVM_ABI Constant *getDeactivationSymbol() const;
```
Even if it only happens to be used in a test.

https://github.com/llvm/llvm-project/pull/171629