hg: jdk/jdk: 8188105: Make -Xshare:auto the default for server VM

[ioi.lam at oracle.com]

Changeset: 08829995db7c
Author:    iklam
Date:      2018-04-23 07:51 -0700
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/08829995db7c

8188105: Make -Xshare:auto the default for server VM
Reviewed-by: dholmes, lfoltan, acorn, mseledtsov, jiangli

! src/hotspot/share/runtime/arguments.cpp
! test/hotspot/jtreg/runtime/CDSCompressedKPtrs/XShareAuto.java
! test/hotspot/jtreg/runtime/CompressedOops/CompressedClassPointers.java