Add unnamed_addr to the special strings created by

__builtin___CFStringMakeConstantString
This fixes PR8993. A darwin expert might want to check that this is safe.

llvm-svn: 123658

clang/lib/CodeGen/CodeGenModule.cpp

@@ -1589,6 +1589,7 @@ CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
   llvm::GlobalVariable *GV =
     new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C,
                              ".str");
+  GV->setUnnamedAddr(true);
   if (isUTF16) {
     CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy);
     GV->setAlignment(Align.getQuantity());