RFR(XS): 8220707: [TESTBUG] serviceability/sa/TestHeapDumpForLargeArray.java fails with jtreg -vmoption:-Xmx < 8g

[Nick Gasson]

Hi,

Please review this very small test fix to 
serviceability/sa/TestHeapDumpForLargeArray.java:

Bug: https://bugs.openjdk.java.net/browse/JDK-8220707
Webrev: http://cr.openjdk.java.net/~ngasson/8220707/webrev.0/

If you run this test with jtreg option -vmoption:-Xmx512m (or any value 
< 8g) then it will fail with:

STATUS:Failed.`main' threw exception: java.io.IOException: LingeredApp 
terminated with non-zero exit code 1

LingeredAppWithLargeArray needs an -Xmx8g argument but this can be 
overriden by the -Xmx option passed to jtreg, as the default VM 
arguments are added after the explicit ones when creating the 
subprocess. It would work fine if they were added in the other order.

Thanks,
Nick