Add test for new Symbol()

Author: JsonFreeman

tests/baselines/reference/symbolType14.errors.txt

@@ -0,0 +1,7 @@
+tests/cases/conformance/es6/Symbols/symbolType14.ts(1,1): error TS2350: Only a void function can be called with the 'new' keyword.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType14.ts (1 errors) ====
+    new Symbol();
+    ~~~~~~~~~~~~
+!!! error TS2350: Only a void function can be called with the 'new' keyword.

tests/baselines/reference/symbolType14.js

@@ -0,0 +1,5 @@
+//// [symbolType14.ts]
+new Symbol();
+
+//// [symbolType14.js]
+new Symbol();

tests/cases/conformance/es6/Symbols/symbolType14.ts

@@ -0,0 +1,2 @@
+//@target: ES6
+new Symbol();