Avoid leaking CompileUnits in DwarfDebug.cpp.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98268 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 40d1d64..2ce575c 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -473,7 +473,7 @@
   /// as well.
   unsigned GetOrCreateSourceID(StringRef DirName, StringRef FileName);
 
-  CompileUnit *constructCompileUnit(MDNode *N);
+  void constructCompileUnit(MDNode *N);
 
   void constructGlobalVariableDIE(MDNode *N);