[clang] [llvm] [ARM][AArch64] BTI, GCS, PAC Module flag update. (PR #86212)

[Daniel Kiss via cfe-commits]

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@@ -5975,6 +5975,120 @@ void llvm::UpgradeFunctionAttributes(Function &F) {
   }
 }
 
+// Check if the function attribute is not present and set it.
+static void SetFunctionAttrIfNotSet(Function &F, StringRef FnAttrName,
+                                    StringRef Value) {
+  if (!F.hasFnAttribute(FnAttrName))
+    F.addFnAttr(FnAttrName, Value);
+}
+
+// Check if the function attribute is not present and set it if needed.
+// If the attribute is "false" then removes it.
+// If the attribute is "true" resets it to a valueless attribute.
+static void ConvertFunctionAttr(Function &F, bool Set, StringRef FnAttrName) {
+  if (!F.hasFnAttribute(FnAttrName)) {
+    if (Set)
+      F.addFnAttr(FnAttrName);
+  } else {
+    auto A = F.getFnAttribute(FnAttrName);
+    if ("false" == A.getValueAsString())
+      F.removeFnAttr(FnAttrName);
+    else if ("true" == A.getValueAsString()) {
+      F.removeFnAttr(FnAttrName);
+      F.addFnAttr(FnAttrName);
+    }
+  }
+}
+
+void llvm::CopyModuleAttrToFunctions(Module &M) {
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DanielKristofKiss wrote:

done

https://github.com/llvm/llvm-project/pull/86212