hg: panama/dev: Automatic merge with foreign

[maurizio.cimadamore at oracle.com]

Changeset: 2081fcfb7b46
Author:    mcimadamore
Date:      2019-01-02 22:11 +0100
URL:       http://hg.openjdk.java.net/panama/dev/rev/2081fcfb7b46

Automatic merge with foreign

! make/autoconf/toolchain.m4
! make/jdk/src/classes/build/tools/spp/Spp.java
! src/hotspot/share/runtime/globals.hpp