Support assembler modules with line info only

[Vladimir Prus]

The attached patch allows gdb to debug assembler modules that have only
line number information, and nothing else (including function names).


Changerlog entry:
2005-07-14  Vladimur Prus <ghost@cs.msu.su>

     gdb/infrun.c (handle_inferior_event): When deciding if we've entered
	    undebuggable function, check for ecs->sal.line != 0, not for
        ecs->stop_func_name != NULL.


Thanks,
Volodya
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