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

[via llvm-commits]

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@@ -1392,6 +1402,10 @@ void LowerTypeTestsModule::replaceWeakDeclarationWithJumpTablePtr(
   // Don't use range based loop, because use list will be modified.
   while (!PlaceholderFn->use_empty()) {
     Use &U = *PlaceholderFn->use_begin();
+    if (isFunctionAnnotation(U.getUser())) {
+      U.set(F);
+      continue;
+    }
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yozhu wrote:

Right, this is not needed.  I was originally only considering the function declaration case, and later added code in replaceCfiUses() to cover function definition case.

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