RFR(XS) 8191683: Compile problem on ARM after JDK-8043070

[Igor Veresov]

My recent change caused a compilation problem on ARM, where char is unsigned by default. This fix changes _state to be signed explicitly.

Webrev: http://cr.openjdk.java.net/~iveresov/8191683/webrev.00/ <http://cr.openjdk.java.net/~iveresov/8191683/webrev.00/>

Thanks,
igor
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