Fix thinko in last patch

gcc/
	* tree-ssa-dom.cc (record_edge_info): Fix thinko in last commit.
diff --git a/gcc/tree-ssa-dom.cc b/gcc/tree-ssa-dom.cc
index e82f4f7..c9e52d1 100644
--- a/gcc/tree-ssa-dom.cc
+++ b/gcc/tree-ssa-dom.cc
@@ -676,7 +676,7 @@
 		     if it never traverses the backedge to begin with.  This
 		     implies that any PHI nodes create equivalances that we
 		     can attach to the loop exit edge.  */
-		  int bool
+		  bool alternative
 		    = (EDGE_PRED (bb, 0)->flags & EDGE_DFS_BACK) ? 1 : 0;
 
 		  gphi_iterator gsi;