force default parameter IIFE on reference to eval

test/core/fixtures/transformation/es6.parameters.default/eval/actual.js

@@ -0,0 +1,6 @@
+let x = "outside";
+function outer(a = () => eval("x")) {
+  let x = "inside";
+  return a();
+}
+outer();

test/core/fixtures/transformation/es6.parameters.default/eval/expected.js

@@ -0,0 +1,13 @@
+"use strict";
+
+var x = "outside";
+function outer() {
+  var a = arguments[0] === undefined ? function () {
+    return eval("x");
+  } : arguments[0];
+  return (function () {
+    var x = "inside";
+    return a();
+  })();
+}
+outer();