Use setter and getter for demangled_name.

Use setter and getter for demangled_name.

2010-07-16  Sami Wagiaalla  <swagiaal@redhat.com>

	* symtab.h (symbol_set_demangled_name): New function.
	(symbol_get_demangled_name): New function.
	* symtab.c (symbol_set_demangled_name): New function.
	(symbol_get_demangled_name): New function.
	(symbol_init_language_specific): Use demangled_name setter and getter.
	(symbol_set_names): Ditto.
	(symbol_natural_name): Ditto.
	(symbol_demangled_name): Ditto.
	* dwarf2read.c (new_symbol): Ditto.