Add failing test for smartSelect string literals

Author: andrewbranch

tests/cases/fourslash/smartSelection_stringLiteral.ts

@@ -0,0 +1,6 @@
+/// <reference path="fourslash.ts" />
+
+//// const a = 'a';
+//// const b = /**/'b';
+
+verify.baselineSmartSelection();