RFR: 8232571: Add missing SIGINFO signal

[Benoit Daloze]

Hello,

Please review the following fix for 
https://bugs.openjdk.java.net/browse/JDK-8232571

In short, new sun.misc.Signal("INFO") throws IllegalArgumentException on 
JDK11+
due to the signal not being in the known signal list. This is a 
regression, it worked fine in JDK8.

I attach a patch to fix this,.

Bug: https://bugs.openjdk.java.net/browse/JDK-8232571

Thanks,
Benoit Daloze
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