RFR (S): 8131734: Add free_archive_regions support to G1 for -Xshared:auto

[Jiangli Zhou]

Hi,

Here is the runtime part of the bug fix that calls the new free_archive_regions() when shared string mapping fails. I also added a jtreg test to test shared strings with -Xshare:auto.

  http://cr.openjdk.java.net/~jiangli/8131734/webrev.00/

Test:
- Tested by explicitly making the shared string mapping fail on linux-x64, -Xshare:auto runs without crash with the fix
- Tested with the new SharedStringsRunAuto test
- Tested with XX:+PrintNMTStatistics -XX:NativeMemoryTracking=detail

Thanks,
Jiangli
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