Request for review: 8009778: NPG: ClassMetaspaceSize is used before set in set_ergonomics_flags()

[harold seigel]

Hi,

Please review this fix for bug 8009778.

The fix adds a function, class_metaspace_size_for_compressed_ptrs(), 
that returns what the value will be for ClassMetaspaceSize if 
CompressedKlassPointers are used.  This enables the correct value for 
ClassMetaspaceSize to be used by max_heap_for_compressed_oops() before 
ClassMetaspaceSize gets set in set_ergonomics_flags().

The fix was tested with JCK lang and vm tests, UTE vm.quick.testlist and 
vm.mlvm.testlist tests, JPRT, and jtreg tests. Tests were run on Linux 
and Solaris. The debugger was used to step through the code to ensure 
that the fix behaved as expected.

Open webrev at http://cr.openjdk.java.net/~hseigel/bug_8009778/ 
<http://cr.openjdk.java.net/%7Ehseigel/bug_8009778/>

Bug link at http://bugs.sun.com/view_bug.do?bug_id=8009778

JBS bug link at https://jbs.oracle.com/bugs/browse/JDK-8009778

Thanks, Harold