xdiff: delete fields ha, line, size in xdlclass_t in favor of an xrecord_t

The fields from xdlclass_t are aliases of xrecord_t:
xdlclass_t.line -> xrecord_t.ptr
xdlclass_t.size -> xrecord_t.size
xdlclass_t.ha   -> xrecord_t.ha

xdlclass_t carries a copy of the data in xrecord_t, but instead of
embedding xrecord_t it duplicates the individual fields. A future
commit will change the types used in xrecord_t so embed it in
xdlclass_t first, so we don't have to remember to change the types
here as well.

Best-viewed-with: --color-words
Helped-by: Phillip Wood <phillip.wood123@gmail.com>
Signed-off-by: Ezekiel Newren <ezekielnewren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: ezekielnewren

xdiff/xprepare.c

@@ -32,9 +32,7 @@
 
 typedef struct s_xdlclass {
 	struct s_xdlclass *next;
-	unsigned long ha;
-	char const *line;
-	long size;
+	xrecord_t rec;
 	long idx;
 	long len1, len2;
 } xdlclass_t;
@@ -93,14 +91,12 @@ static void xdl_free_classifier(xdlclassifier_t *cf) {
 
 static int xdl_classify_record(unsigned int pass, xdlclassifier_t *cf, xrecord_t *rec) {
 	long hi;
-	char const *line;
 	xdlclass_t *rcrec;
 
-	line = rec->ptr;
 	hi = (long) XDL_HASHLONG(rec->ha, cf->hbits);
 	for (rcrec = cf->rchash[hi]; rcrec; rcrec = rcrec->next)
-		if (rcrec->ha == rec->ha &&
-				xdl_recmatch(rcrec->line, rcrec->size,
+		if (rcrec->rec.ha == rec->ha &&
+				xdl_recmatch(rcrec->rec.ptr, rcrec->rec.size,
 					rec->ptr, rec->size, cf->flags))
 			break;
 
@@ -113,9 +109,7 @@ static int xdl_classify_record(unsigned int pass, xdlclassifier_t *cf, xrecord_t
 		if (XDL_ALLOC_GROW(cf->rcrecs, cf->count, cf->alloc))
 				return -1;
 		cf->rcrecs[rcrec->idx] = rcrec;
-		rcrec->line = line;
-		rcrec->size = rec->size;
-		rcrec->ha = rec->ha;
+		rcrec->rec = *rec;
 		rcrec->len1 = rcrec->len2 = 0;
 		rcrec->next = cf->rchash[hi];
 		cf->rchash[hi] = rcrec;