Add DbgVariable::resolve per Eric's suggestion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192218 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index e8ca9d2..6d22f27 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -209,6 +209,11 @@
     return Var.getAddrElement(i);
   }
   DIType getType() const;
+
+private:
+  /// resolve - Look in the DwarfDebug map for the MDNode that
+  /// corresponds to the reference.
+  template <typename T> T resolve(DIRef<T> Ref) const;
 };
 
 /// \brief Collects and handles information specific to a particular