First cut at supporting .debug_loc section. 
This is used to track variable information.

llvm-svn: 104649
diff --git a/llvm/lib/CodeGen/AsmPrinter/DIE.h b/llvm/lib/CodeGen/AsmPrinter/DIE.h
index 9cb8314..d56c094 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DIE.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DIE.h
@@ -315,6 +315,10 @@
     ///
     virtual void EmitValue(AsmPrinter *AP, unsigned Form) const;
 
+    /// getValue - Get MCSymbol.
+    ///
+    const MCSymbol *getValue()       const { return Label; }
+
     /// SizeOf - Determine size of label value in bytes.
     ///
     virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const;