Initial support for dumping DWARF corresponding to Swift code

src/common/dwarf_cu_to_module.h

Index: src/common/dwarf_cu_to_module.h
diff --git a/src/common/dwarf_cu_to_module.h b/src/common/dwarf_cu_to_module.h
index fca92710e6f74366d4e10a194edc41e81fd85f43..a36b82b0e47ef431ba64b3d057d6b6f475d4ee8d 100644
--- a/src/common/dwarf_cu_to_module.h
+++ b/src/common/dwarf_cu_to_module.h
@@ -202,7 +202,7 @@ class DwarfCUToModule: public dwarf2reader::RootDIEHandler {
     virtual void UnnamedFunction(uint64 offset);
 
     // __cxa_demangle() failed to demangle INPUT.
-    virtual void DemangleError(const string &input, int error);
+    virtual void DemangleError(const string &input);
 
     // The DW_FORM_ref_addr at OFFSET to TARGET was not handled because
     // FilePrivate did not retain the inter-CU specification data.