hg: panama/dev: Automatic merge with foreign

[maurizio.cimadamore at oracle.com]

Changeset: 2d2917845497
Author:    mcimadamore
Date:      2018-12-26 22:11 +0100
URL:       http://hg.openjdk.java.net/panama/dev/rev/2d2917845497

Automatic merge with foreign

! src/hotspot/cpu/x86/x86_64.ad
- src/hotspot/share/runtime/arguments_ext.hpp
- src/hotspot/share/services/diagnosticCommand_ext.hpp
- test/langtools/jdk/javadoc/doclet/lib/JavadocTester.java