Remove some dead code. (DarwinGDBCompat was retired in r189903).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192731 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -196,9 +196,8 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
   DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = 0;
   FunctionBeginSym = FunctionEndSym = 0;
 
-  // Turn on accelerator tables and older gdb compatibility
-  // for Darwin by default, pubnames by default for non-Darwin,
-  // and handle split dwarf.
+  // Turn on accelerator tables for Darwin by default, pubnames by
+  // default for non-Darwin, and handle split dwarf.
   bool IsDarwin = Triple(A->getTargetTriple()).isOSDarwin();
 
   if (DwarfAccelTables == Default)
@@ -223,8 +222,6 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
     beginModule();
   }
 }
-DwarfDebug::~DwarfDebug() {
-}
 
 // Switch to the specified MCSection and emit an assembler
 // temporary label to it if SymbolStem is specified.

lib/CodeGen/AsmPrinter/DwarfDebug.h

@@ -429,9 +429,6 @@ class DwarfDebug {
   // Holders for the various debug information flags that we might need to
   // have exposed. See accessor functions below for description.
 
-  // Whether or not we're emitting info for older versions of gdb on darwin.
-  bool IsDarwinGDBCompat;
-
   // Holder for imported entities.
   typedef SmallVector<std::pair<const MDNode *, const MDNode *>, 32>
     ImportedEntityMap;
@@ -661,7 +658,6 @@ public:
   // Main entry points.
   //
   DwarfDebug(AsmPrinter *A, Module *M);
-  ~DwarfDebug();
 
   /// \brief Emit all Dwarf sections that should come prior to the
   /// content.
@@ -702,10 +698,6 @@ public:
   /// \brief Recursively Emits a debug information entry.
   void emitDIE(DIE *Die, std::vector<DIEAbbrev *> *Abbrevs);
 
-  /// \brief Returns whether or not to limit some of our debug
-  /// output to the limitations of darwin gdb.
-  bool useDarwinGDBCompat() { return IsDarwinGDBCompat; }
-
   // Experimental DWARF5 features.
 
   /// \brief Returns whether or not to emit tables that dwarf consumers can