* sim-base.h (struct sim_state_base): Add prog_syms and

	* sim-base.h (struct sim_state_base): Add prog_syms and
	define macro STATE_PROG_SYMS.
	* sim-trace.c (trace_one_insn): Add variables abfd, symsize,
	symbol_count, and asymbols.  Call bfd_get_symtab_upper_bound
	and bfd_canonicalize_symtab, to get symbol table on first use
	and preserve it via STATE_PROG_SYMS for future calls to
	bfd_find_nearest_line.