[NFC][Clang] Add missing & to function argument

clang/lib/CodeGen/CGCall.cpp

for (StringRef Attr : CodeGenOpts.DefaultFunctionAttrs) {
     FuncAttrs.addAttribute(Var, Value);
   }
 }
 
 /// Adds attributes to \p F according to our \p CodeGenOpts and \p LangOpts, as
 /// though we had emitted it ourselves. We remove any attributes on F that
 /// conflict with the attributes we add here.
 static void mergeDefaultFunctionDefinitionAttributes(
-    llvm::Function &F, const CodeGenOptions CodeGenOpts,
+    llvm::Function &F, const CodeGenOptions &CodeGenOpts,
     const LangOptions &LangOpts, const TargetOptions &TargetOpts,
     bool WillInternalize) {
 
   llvm::AttrBuilder FuncAttrs(F.getContext());
   // Here we only extract the options that are relevant compared to the version
   // from GetCPUAndFeaturesAttributes.
   if (!TargetOpts.CPU.empty())
     FuncAttrs.addAttribute("target-cpu", TargetOpts.CPU);