hg: jdk/sandbox: 8232571: Add missing SIGINFO signal

[chris.hegarty at oracle.com]

Changeset: c9c3bb79861e
Author:    dholmes
Date:      2019-10-22 22:00 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/c9c3bb79861e

8232571: Add missing SIGINFO signal
Reviewed-by: dholmes, rriggs
Contributed-by: Benoit Daloze <benoit.daloze at oracle.com>

! src/hotspot/os/posix/os_posix.cpp
+ test/hotspot/jtreg/runtime/signal/TestSiginfo.java
! test/jdk/sun/misc/SunMiscSignalTest.java