* ada-lang.c (ada_decode_symbol): Check and set 'ada_mangled'.

	* ada-lang.c (ada_decode_symbol): Check and set 'ada_mangled'.
	Use symbol's obstack, not an objfile.
	* coffread.c (process_coff_symbol): Update.
	* dwarf2read.c (fixup_go_packaging, new_symbol_full): Update.
	* jv-lang.c (add_class_symbol): Update.
	* mdebugread.c (new_symbol): Update.
	* minsyms.c (prim_record_minimal_symbol_full)
	(terminate_minimal_symbol_table): Update.
	* psymtab.c (add_psymbol_to_bcache): Clear entire symbol.  Update.
	* stabsread.c (define_symbol, read_enum_type): Update.
	* symtab.c (symbol_set_demangled_name, symbol_get_demangled_name):
	Handle Ada specially.
	(symbol_set_language): Add 'obstack' argument.
	(symbol_set_names): Update.
	(symbol_natural_name, symbol_demangled_name): Always use
	ada_decode_symbol.
	* symtab.h (struct general_symbol_info)
	<language_specific::obstack>: New field.
	<ada_mangled>: New field.
	(SYMBOL_SET_LANGUAGE): Add 'obstack' argument.
	(symbol_set_language): Update.