avoid dead code insertion during insertOnEdge

Author: benSepanski

src/main/java/soot/UnitPatchingChain.java

@@ -134,7 +134,7 @@ public void insertOnEdge(Collection<? extends Unit> toInsert, Unit point_src, Un
       innerChain.insertBefore(toInsert, point_tgt);
 
       if (originalPred != point_src) {
-        if (originalPred instanceof GotoStmt) {
+        if (!originalPred.fallsThrough()) {
           return;
         }