[line-map] simple oneliner that speeds up track-macro-expansion

[Dimitrios Apostolou]

Hello list,

the attached simple patch is a small part of the fix in Bug #53525, but it 
is independant and offers a noticeable performance improvement for 
track-macro-expansion. No regressions tested on x86, besides memory usage 
going up some KB.

I don't get why the max_column_hint was zeroed in every macro. Maybe there 
are pathological cases that I don't see?


2012-06-04  Dimitrios Apostolou <jimis@gmx.net>

 	* line-map.c (linemap_enter_macro): Don't zero max_column_hint in
 	every macro. This improves performance by reducing the number of
 	reallocations when track-macro-expansion is on.


Thanks
Dimitris
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