Merge pull request swiftlang#2185 from apple/PR-71957796-20200714

Add back the code I removed from addDefaultFunctionDefinitionAttributes in 04cd235

Author: ahatanaka

clang/lib/CodeGen/CGCall.cpp

@@ -1797,6 +1797,14 @@ void CodeGenModule::getDefaultFunctionAttributes(StringRef Name,
       FuncAttrs.addAttribute("stackrealign");
     if (CodeGenOpts.Backchain)
       FuncAttrs.addAttribute("backchain");
+    if (CodeGenOpts.PointerAuth.ReturnAddresses)
+      FuncAttrs.addAttribute("ptrauth-returns");
+    if (CodeGenOpts.PointerAuth.FunctionPointers)
+      FuncAttrs.addAttribute("ptrauth-calls");
+    if (CodeGenOpts.PointerAuth.IndirectGotos)
+      FuncAttrs.addAttribute("ptrauth-indirect-gotos");
+    if (CodeGenOpts.PointerAuth.AuthTraps)
+      FuncAttrs.addAttribute("ptrauth-auth-traps");
     if (CodeGenOpts.EnableSegmentedStacks)
       FuncAttrs.addAttribute("split-stack");