RFR(S): 8140759: add ES6 template literal test

[Michael Haupt]

Dear all,

please review this change.
Issue: https://bugs.openjdk.java.net/browse/JDK-8140759
Webrev: http://cr.openjdk.java.net/~mhaupt/8140759/webrev.00

In preparing the push of ES6 template literal support yesterday, I forgot to add the test files. Sorry about that.

Best,

Michael

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