Switch from internal to linker_private linkage, it is sufficient to please the new linker.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127622 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 4753bc3..24b3c32 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -1672,7 +1672,7 @@
     // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error
     // when using private linkage. It is not clear if this is a bug in ld
     // or a reasonable new restriction.
-    Linkage = llvm::GlobalValue::InternalLinkage;
+    Linkage = llvm::GlobalValue::LinkerPrivateLinkage;
     isConstant = !Features.WritableStrings;
   }