MC: Add target hook to control symbol quoting

llvm-svn: 239370
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCExpr.h b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCExpr.h
index 13700b1..9146d4d 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCExpr.h
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCExpr.h
@@ -56,7 +56,7 @@
 
   /// @}
 
-  void printImpl(raw_ostream &OS) const override;
+  void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
   bool evaluateAsRelocatableImpl(MCValue &Res,
                                  const MCAsmLayout *Layout,
                                  const MCFixup *Fixup) const override {