Emit correct linkage-name attribute based on DWARF version.

There are still 4 tests that check for DW_AT_MIPS_linkage_name,
because they specify DWARF 2 or 3 in the module metadata. So, I didn't
create an explicit version-based test for the attribute.

Differential Revision: http://reviews.llvm.org/D8227


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231880 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfUnit.h

@@ -252,6 +252,9 @@ public:
   void addConstantFPValue(DIE &Die, const MachineOperand &MO);
   void addConstantFPValue(DIE &Die, const ConstantFP *CFP);
 
+  /// \brief Add a linkage name, if it isn't empty.
+  void addLinkageName(DIE &Die, StringRef LinkageName);
+
   /// addTemplateParams - Add template parameters in buffer.
   void addTemplateParams(DIE &Buffer, DIArray TParams);