Revert "[llvm][ARM][AArch64] Add attributes to synthetic functions. (#83153)"

This reverts commit 4c7fd7e.

Author: DanielKristofKiss

llvm/lib/IR/Function.cpp

@@ -407,35 +407,6 @@ Function *Function::createWithDefaultAttr(FunctionType *Ty,
   StringRef DefaultFeatures = F->getContext().getDefaultTargetFeatures();
   if (!DefaultFeatures.empty())
     B.addAttribute("target-features", DefaultFeatures);
-
-  // Check if the module attribute is present and not zero.
-  auto isModuleAttributeSet = [&](const StringRef &ModAttr) -> bool {
-    const auto *Attr =
-        mdconst::extract_or_null<ConstantInt>(M->getModuleFlag(ModAttr));
-    return Attr && !Attr->isZero();
-  };
-
-  auto AddAttributeIfSet = [&](const StringRef &ModAttr) {
-    if (isModuleAttributeSet(ModAttr))
-      B.addAttribute(ModAttr);
-  };
-
-  StringRef SignType = "none";
-  if (isModuleAttributeSet("sign-return-address"))
-    SignType = "non-leaf";
-  if (isModuleAttributeSet("sign-return-address-all"))
-    SignType = "all";
-  if (SignType != "none") {
-    B.addAttribute("sign-return-address", SignType);
-    B.addAttribute("sign-return-address-key",
-                   isModuleAttributeSet("sign-return-address-with-bkey")
-                       ? "b_key"
-                       : "a_key");
-  }
-  AddAttributeIfSet("branch-target-enforcement");
-  AddAttributeIfSet("branch-protection-pauth-lr");
-  AddAttributeIfSet("guarded-control-stack");
-
   F->addFnAttrs(B);
   return F;
 }