[DWARF] Add EmitDwarfOffset function, NFC.

Added EmitDwarfOffset function after discussion with Eric Christofer.

llvm-svn: 328212
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
index a1d6f3c..c0d4350 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
@@ -179,6 +179,10 @@
   EmitInt32(S.Offset);
 }
 
+void AsmPrinter::EmitDwarfOffset(const MCSymbol *Label, uint64_t Offset) const {
+  EmitLabelPlusOffset(Label, Offset, MAI->getCodePointerSize());
+}
+
 //===----------------------------------------------------------------------===//
 // Dwarf Lowering Routines
 //===----------------------------------------------------------------------===//