Add a helper getSymbol to AsmPrinter.

llvm-svn: 193627
diff --git a/llvm/lib/Target/SystemZ/SystemZMCInstLower.cpp b/llvm/lib/Target/SystemZ/SystemZMCInstLower.cpp
index 0f46ad2..ff9a6c0 100644
--- a/llvm/lib/Target/SystemZ/SystemZMCInstLower.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZMCInstLower.cpp
@@ -42,7 +42,7 @@
     break;
 
   case MachineOperand::MO_GlobalAddress:
-    Symbol = AsmPrinter.Mang->getSymbol(MO.getGlobal());
+    Symbol = AsmPrinter.getSymbol(MO.getGlobal());
     break;
 
   case MachineOperand::MO_ExternalSymbol: