MDEV-20950: Fix 32-bit Windows build

storage/innobase/include/rem0rec.h

@@ -455,7 +455,7 @@ value.
 @return offset of the start of the field, SQL null flag and extern
 storage flag ORed */
 UNIV_INLINE
-ulint
+offset_t
 rec_2_get_field_end_info(
 /*=====================*/
 	const rec_t*	rec,	/*!< in: record */

storage/innobase/include/rem0rec.ic

@@ -883,7 +883,7 @@ value.
 @return offset of the start of the field, SQL null flag and extern
 storage flag ORed */
 UNIV_INLINE
-ulint
+offset_t
 rec_2_get_field_end_info(
 /*=====================*/
 	const rec_t*	rec,	/*!< in: record */

storage/innobase/page/page0zip.cc

@@ -3171,7 +3171,7 @@ zlib_error:
 		offsets = static_cast<offset_t*>(
 			mem_heap_alloc(heap, n * sizeof(ulint)));
 
-		*offsets = n;
+		rec_offs_set_n_alloc(offsets, n);
 	}
 
 	/* Decompress the records in heap_no order. */

storage/innobase/rem/rem0rec.cc

@@ -481,7 +481,8 @@ resolved:
 		/* Old-style record: determine extra size and end offsets */
 		offs = REC_N_OLD_EXTRA_BYTES;
 		if (rec_get_1byte_offs_flag(rec)) {
-			offs += rec_offs_n_fields(offsets);
+			offs += static_cast<offset_t>(
+				rec_offs_n_fields(offsets));
 			*rec_offs_base(offsets) = offs;
 			/* Determine offsets to fields */
 			do {

storage/innobase/row/row0merge.cc

@@ -1061,8 +1061,10 @@ row_merge_heap_create(
 	*offsets2 = static_cast<offset_t*>(
 		mem_heap_alloc(heap, i * sizeof **offsets2));
 
-	(*offsets1)[0] = (*offsets2)[0] = i;
-	(*offsets1)[1] = (*offsets2)[1] = dict_index_get_n_fields(index);
+	rec_offs_set_n_alloc(*offsets1, i);
+	rec_offs_set_n_alloc(*offsets2, i);
+	rec_offs_set_n_fields(*offsets1, dict_index_get_n_fields(index));
+	rec_offs_set_n_fields(*offsets2, dict_index_get_n_fields(index));
 
 	return(heap);
 }