Re: RFR: JDK-8144312: Remove limitations on the default number of jobs in the build

[Martin Buchholz]

We can fix both JDK-6515172 and JDK-8144312 by doing the autconf
detection of how to count the number of allowed processors, then
actually measuring what's available during the build, and also fixing
the hotspot implemementation of Runtime.availableProcessors.