RFR (S) round 0 for 8136552 Last argument wins does not work for special options with "-XX:VMOptionsFile" option

[Ron Durbin]

JDK-8136552 Last argument wins does not work for special options with "-XX:VMOptionsFile" option

The webrev includes both the code fix from Ron and the proposed changes in test coverage from Dmitry.

Webrev link:
http://cr.openjdk.java.net/~rdurbin/8136552_OCR0_JDK9_webrev/

Defect link:
https://bugs.openjdk.java.net/browse/JDK-8136552/


This bug fix has been tested on:
      OS:
        Solaris, MAC, Windows, Linux
      Tests:
        Manual unit tests
        JPRT with -testset hotspot(including proposed SQE test coverage for this bug fix.)