hg: jdk/jdk: 8239450: Overhaul JVM feature handling in configure

[magnus.ihse.bursie at oracle.com]

Changeset: 8432f7d4f51c
Author:    ihse
Date:      2020-02-20 10:33 +0100
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/8432f7d4f51c

8239450: Overhaul JVM feature handling in configure
Reviewed-by: erikj

! doc/building.html
! doc/building.md
! make/autoconf/basics.m4
! make/autoconf/configure.ac
! make/autoconf/help.m4
! make/autoconf/hotspot.m4
! make/autoconf/jdk-options.m4
+ make/autoconf/jvm-features.m4
! make/conf/jib-profiles.js
! src/hotspot/.mx.jvmci/mx_jvmci.py