Disable variable merging

This tightens the scope of variables, which is nicer for readability -
particularly as Fernflower likes sticking variable declarations in the
middle of long if/else chains.

src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarVersionsProcessor.java

@@ -40,7 +40,7 @@ public class VarVersionsProcessor {
 
     typeProcessor.calculateVarTypes(root, graph);
 
-    simpleMerge(typeProcessor, graph, method);
+    //simpleMerge(typeProcessor, graph, method);
 
     // FIXME: advanced merging