Darwin HiddenDirective is .private_extern.

llvm-svn: 33465
diff --git a/llvm/lib/Target/ARM/ARMTargetAsmInfo.cpp b/llvm/lib/Target/ARM/ARMTargetAsmInfo.cpp
index 8c4acdd8..015e834 100644
--- a/llvm/lib/Target/ARM/ARMTargetAsmInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMTargetAsmInfo.cpp
@@ -25,6 +25,7 @@
     ZeroFillDirective = "\t.zerofill\t";  // Uses .zerofill
     SetDirective = "\t.set";
     WeakRefDirective = "\t.weak_reference\t";
+    HiddenDirective = "\t.private_extern\t";
     JumpTableDataSection = ".const";
     CStringSection = "\t.cstring";
     LCOMMDirective = "\t.lcomm\t";