infer class name for classes that have static properties (#3589)

packages/babel-plugin-transform-class-properties/test/fixtures/general/static-infer-name/actual.js

@@ -0,0 +1,3 @@
+var Foo = class {
+  static num = 0;
+}

packages/babel-plugin-transform-class-properties/test/fixtures/general/static-infer-name/exec.js

@@ -0,0 +1,7 @@
+var Foo = class {
+  static num = 0;
+}
+
+assert.equal(Foo.num, 0);
+assert.equal(Foo.num = 1, 1);
+assert.equal(Foo.name, "Foo");

packages/babel-plugin-transform-class-properties/test/fixtures/general/static-infer-name/expected.js

@@ -0,0 +1,5 @@
+var _class, _temp;
+
+var Foo = (_temp = _class = function Foo() {
+  babelHelpers.classCallCheck(this, Foo);
+}, _class.num = 0, _temp);