RFR 8193150: Create a jtreg version of the test from JDK-8187143

[Paru Somashekar]

Hi,

Please review the fix for JDK-8193150.

The fix introduces a new jtreg test, NashornPopFrameTest. It is based on 
the original test from JDK-8187143 
<https://bugs.openjdk.java.net/browse/JDK-8187143> that was provided by 
the customer.

Bug : https://bugs.openjdk.java.net/browse/JDK-8193150 
<https://bugs.openjdk.java.net/browse/JDK-8193150>
Webrev : http://cr.openjdk.java.net/~psomashe/8193150/webrev/ 
<http://cr.openjdk.java.net/%7Epsomashe/8193150/webrev/>

Here is a brief description of what the test does :-

* The debuggee,  creates and uses a Nashorn engine to evaluate a simple 
script.

* The debugger  tries to set a breakpoint in Nashorn's internal DEBUGGER 
method.
* When the breakpoint is reached, it looks for stack frame whose 
method's declaring type name starts with (nashorn dynamically generated 
classes) "jdk.nashorn.internal.scripts.Script$".
* It then pops stack frames using the ThreadReference.popFrames() call, 
up to and including the above stackframe.
* The execution of the debuggee application is resumed after the needed 
frames have been popped.

This test is included in the ProblemList as it fails under some 
circumstances (bug JDK-8187143) 
<https://bugs.openjdk.java.net/browse/JDK-8187143>. Is always passes 
with the -Xint flag however always fails with -Xcomp. It fails 
intermittently with the -Xmixed (default).

thanks,
Paru.
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