* symtab.h (SYMBOL_SET_LINKAGE_NAME): Update comment.

	* symtab.h (SYMBOL_SET_LINKAGE_NAME): Update comment.
	* symfile.c (allocate_symtab): Don't use obsavestring on a
	constant string.
	* stabsread.c (define_symbol): Don't use obsavestring on a
	constant string.
	* mdebugread.c (parse_type): Don't use obsavestring on a constant
	string.
	(new_symtab): Likewise.
	* elfread.c (elf_symtab_read): Don't use obsavestring on a
	constant string.