RFR: 8143587: compiler/compilercontrol/commandfile/LogTest.java fails on Mac OS with SIGSEGV

[David Lindholm]

Hi,

Please review the following patch that fixes the case where we allocate 
a humongous object, and where the space left in the humongous region 
cannot fit a filler object. In that case we must set top of the last 
heap region to the end of the object. Also, there is a new jtreg test 
which crashes the JVM before this patch, and works fine after.

Bug: https://bugs.openjdk.java.net/browse/JDK-8143587
Webrev: http://cr.openjdk.java.net/~david/JDK-8143587/webrev.00/

Testing: Passed jprt including new test.


Thanks,
David