patch 7.4.2337

Problem:    taglist() is still slow. (Luc Hermitte)
Solution:   Check for CTRL-C less often when finding duplicates.

src/tag.c

@@ -2401,7 +2401,7 @@ parse_line:
 				      && vim_memcmp(mfp2->match, mfp->match,
 						       (size_t)mfp->len) == 0)
 				  break;
-			      line_breakcheck();
+			      fast_breakcheck();
 			  }
 			if (i < 0)
 			{