unify line number handling patch 1

[Joern Rennecke]

> 	* input.h (input_filename, lineno): Remove.
> 	(location_s, location_t): Move from location.h.
> 	(input_location): New.
> 	(input_filename, input_line): New #defines.

Maintainability is also about ease of debugging.  Instead of

cond 5 cur_insn_uid == 4095 && lineno >= 5030
display lineno
...
cond 5 cur_insn_uid == 4095 && lineno == 5172

I'll have to type:

cond 5 cfun->emit->x_cur_insn_uid == 4095 && input_location.line >= 5030
display input_location.line
...
cond 5 cfun->emit->x_cur_insn_uid == 4095 && input_location.line == 5172


Why can't we just have cfun->insn_uid and input.line ? 


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