make PathHoister much more flexible, now ignores global references and will not deopt on reassignments and will instead hoist as high as it can, this also fixes #1529 since the order of operations has changed

test/core/fixtures/transformation/optimisation.react.constant-elements/global-reference/actual.js

@@ -0,0 +1,5 @@
+var Foo = React.createClass({
+  render: function render() {
+    return <div foo={notDeclared}></div>;
+  }
+});

test/core/fixtures/transformation/optimisation.react.constant-elements/global-reference/expected.js

@@ -0,0 +1,9 @@
+"use strict";
+
+var _ref = <div foo={notDeclared}></div>;
+
+var Foo = React.createClass({
+  render: function render() {
+    return _ref;
+  }
+});

test/core/fixtures/transformation/optimisation.react.constant-elements/parameter-reference/actual.js

@@ -0,0 +1,11 @@
+function render(text) {
+  return function () {
+    return <div>{text}</div>;
+  };
+}
+
+function render() {
+  return function (text) {
+    return <div>{text}</div>;
+  };
+}

test/core/fixtures/transformation/optimisation.react.constant-elements/parameter-reference/expected.js

@@ -0,0 +1,15 @@
+"use strict";
+
+function render(text) {
+  var _ref = <div>{text}</div>;
+
+  return function () {
+    return _ref;
+  };
+}
+
+function render() {
+  return function (text) {
+    return <div>{text}</div>;
+  };
+}

test/core/fixtures/transformation/optimisation.react.constant-elements/reassignment/actual.js

@@ -0,0 +1,7 @@
+function render(text) {
+  text += "yes";
+
+  return function () {
+    return <div>{text}</div>;
+  };
+}

test/core/fixtures/transformation/optimisation.react.constant-elements/reassignment/expected.js

@@ -0,0 +1,11 @@
+"use strict";
+
+function render(text) {
+  text += "yes";
+
+  var _ref = <div>{text}</div>;
+
+  return function () {
+    return _ref;
+  };
+}