ensureBlock on if statements with expression return statements - fixes #764

test/fixtures/transformation/es6-tail-call/expression-consequent/actual.js

@@ -0,0 +1,4 @@
+function f() {
+  if (true) {}
+  else return f()
+}

test/fixtures/transformation/es6-tail-call/expression-consequent/expected.js

@@ -0,0 +1,9 @@
+"use strict";
+
+function f() {
+  _function: while (true) {
+    if (true) {} else {
+      continue _function;
+    }
+  }
+}