Add a 'using' declaration to suppress GCC's -Woverloaded-virtual while we
decide what pattern we want to follow in the future.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169561 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.h b/lib/Target/ARM/ARMISelLowering.h
index 8f7b593..1d5aa4f 100644
--- a/lib/Target/ARM/ARMISelLowering.h
+++ b/lib/Target/ARM/ARMISelLowering.h
@@ -294,6 +294,7 @@
                                     bool MemcpyStrSrc,
                                     MachineFunction &MF) const;
 
+    using TargetLowering::isZExtFree;
     virtual bool isZExtFree(SDValue Val, EVT VT2) const;
 
     /// isLegalAddressingMode - Return true if the addressing mode represented