Change some methods in MCDwarf.cpp to be able to handle an arbitrary

MCStreamer instead of just MCObjectStreamer. Address changes cannot
be as efficient as we have to use DW_LNE_set_addres, but at least
most of the logic is shared.

This will be used so that, with CodeGen still using EmitDwarfLocDirective,
llvm-gcc is able to produce debug_line sections without needing an
assembler that supports .loc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119777 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetMachine.h

@@ -104,6 +104,7 @@ protected: // Can only create subclasses.
   const MCAsmInfo *AsmInfo;
 
   unsigned MCRelaxAll : 1;
+  unsigned MCUseLoc : 1;
 
 public:
   virtual ~TargetMachine();
@@ -169,6 +170,12 @@ public:
   /// relaxed.
   void setMCRelaxAll(bool Value) { MCRelaxAll = Value; }
 
+  /// hasMCUseLoc - Check whether we should use dwarf's .loc directive.
+  bool hasMCUseLoc() const { return MCUseLoc; }
+
+  /// setMCUseLoc - Set whether all we should use dwarf's .loc directive.
+  void setMCUseLoc(bool Value) { MCUseLoc = Value; }
+
   /// getRelocationModel - Returns the code generation relocation model. The
   /// choices are static, PIC, and dynamic-no-pic, and target default.
   static Reloc::Model getRelocationModel();