* printcmd.c (print_address_symbolic): Make it search the
symtabs for variables as well as functions. Add `set print
fast-symbolic-addr' and default it to fast (the old way).
Print line numbers for data items as well as functions.
* symtab.c (find_addr_symbol): Return the symtab and the symbol
address, if a symbol is found (take two more args pointing to
where to store these results).