Some fixes for try...finally

idea/testData/cfg/Finally.jet

@@ -123,3 +123,11 @@ fun t3(a : Int) {
   }
 }
 
+fun tf() {
+  try {
+    return 1
+  }
+  finally {
+    return 2
+  }
+}

idea/testData/checker/UnreachableCode.jet

@@ -129,3 +129,8 @@ fun blockAndAndMismatch() : Boolean {
   <error>(return true) || (return false)</error>
   <error>1</error>
 }
+
+fun tf() {
+  try {return} finally{return}
+  <error>1</error>
+}