hg: jdk9/hs/hotspot: 8170981: Possible access to char array with negative index

[gerard.ziemski at oracle.com]

Changeset: adac66a3f770
Author:    lucy
Date:      2016-12-22 15:01 -0600
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/adac66a3f770

8170981: Possible access to char array with negative index
Summary: Check arithmetic before trying to access array by index.
Reviewed-by: rprotacio, dholmes, gziemski

! src/share/vm/runtime/globals.cpp