RFR: 8190283 - Default heap sizing options select a MaxHeapSize larger than available physical memory in some case

[Bob Vandette]

Please review this simple change that alters the algorithm for selecting the
default heap size on low (~100MB) memory environments.

This issue is blocking the integration of the container improvements (https://bugs.openjdk.java.net/browse/JDK-8146115 <https://bugs.openjdk.java.net/browse/JDK-8146115>).


BUG:
https://bugs.openjdk.java.net/browse/JDK-8190283 <https://bugs.openjdk.java.net/browse/JDK-8190283>

WEBREV:
http://bussund0417.us.oracle.com/export/users/bobv/jdk10hs-base/open/webrev/ <http://bussund0417.us.oracle.com/export/users/bobv/jdk10hs-base/open/webrev/>

Bob.