** Check whether new instruction 'newpc' is in a different line from ** previous instruction 'oldpc'. More often than not, 'newpc' is only ** one or a few instructions after 'oldpc' (it must be after, see ** caller), so try to avoid calling 'luaG_getfuncline'. If they are ** too far apart, there is a good chance of a ABSLINEINFO in the way, ** so it goes directly to 'luaG_getfuncline'. */
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