Remove unused debug-only member variable.

This may've been used at some point but the 'print' member function grew
an Indent parameter that entirely shadows this parameter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193358 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DIE.h

@@ -130,10 +130,6 @@ namespace llvm {
     ///
     SmallVector<DIEValue*, 12> Values;
 
-#ifndef NDEBUG
-    // Private data for print()
-    mutable unsigned IndentCount;
-#endif
   public:
     explicit DIE(unsigned Tag)
         : Offset(0), Size(0), Abbrev((dwarf::Tag)Tag, dwarf::DW_CHILDREN_no),