register named method id as a reference to avoid collisions - fixes #1664

test/core/fixtures/transformation/es6.classes/name-method-collision/actual.js

@@ -0,0 +1,7 @@
+import { a } from "./a";
+
+class Foo {
+  _a() {
+    a();
+  }
+}

test/core/fixtures/transformation/es6.classes/name-method-collision/expected.js

@@ -0,0 +1,17 @@
+"use strict";
+
+var _a2 = require("./a");
+
+var Foo = (function () {
+  function Foo() {
+    babelHelpers.classCallCheck(this, Foo);
+  }
+
+  babelHelpers.createClass(Foo, [{
+    key: "_a",
+    value: function _a() {
+      (0, _a2.a)();
+    }
+  }]);
+  return Foo;
+})();