add completion statement test and enable experimental option on deadCodeElimination tests

test/core/fixtures/transformation/minification.dead-code-elimination/completion-statements/actual.js

@@ -0,0 +1,13 @@
+for (var key in foo) {
+  break;
+  foo();
+}
+
+function bar() {
+  yes();
+  bar();
+  return "wow";
+  nomore();
+}
+
+bar();

test/core/fixtures/transformation/minification.dead-code-elimination/completion-statements/expected.js

@@ -0,0 +1,13 @@
+"use strict";
+
+for (var key in foo) {
+  break;
+}
+
+function bar() {
+  yes();
+  bar();
+  return "wow";
+}
+
+bar();

test/core/fixtures/transformation/minification.dead-code-elimination/options.json

@@ -1,4 +1,5 @@
 {
+  "experimental": true,
   "externalHelpers": true,
   "noCheckAst": true,
   "blacklist": ["regenerator"],