[llvm] [CFI][annotation] Leave alone function pointers in function annotations (PR #80173)

[via llvm-commits]

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@@ -1837,6 +1851,16 @@ LowerTypeTestsModule::LowerTypeTestsModule(
   }
   OS = TargetTriple.getOS();
   ObjectFormat = TargetTriple.getObjectFormat();
+
+  // Function annotation describes or applies to function itself, and
+  // shouldn't be associated with jump table thunk generated for CFI.
+  GlobalAnnotation = M.getGlobalVariable("llvm.global.annotations");
+  auto *C = dyn_cast_or_null<Constant>(GlobalAnnotation);
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yozhu wrote:

This is copied from `llvm/lib/Transform/IPO/Annotation2Metadata.cpp`, at line 33.

https://github.com/llvm/llvm-project/pull/80173